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Posterior enhancement was observed&#46; Power Doppler mode revealed sparse intralesional vascularization&#44; with low-flow venous and arterial vessels measuring 0&#46;2 to 0&#46;4<span class="elsevierStyleHsp" style=""></span>mm in diameter&#59; spectral Doppler mode revealed that the arterial vessels had a maximum systolic peak of 2&#46;2<span class="elsevierStyleHsp" style=""></span>cm&#47;s &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>&#41;&#46; The ultrasound characteristics led us to suspect a benign subcutaneous tumor or hematoma&#46; However&#44; given the time since onset and the patient&#39;s symptoms&#44; the tumor margins were determined using ultrasound&#44; and the lesion was surgically removed&#46;</p><elsevierMultimedia ident="fig0010"></elsevierMultimedia><p id="par0030" class="elsevierStylePara elsevierViewall">Histology revealed a well-defined densely cellular tumor in the dermis composed of 2 cell types&#58; small and intensely basophilic cells arranged around other large&#44; pale cells that clustered to form ductal structures &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Figs&#46; 1</a>B and C&#41;&#46; These findings were compatible with a diagnosis of eccrine spiradenoma&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Discussion</span><p id="par0035" class="elsevierStylePara elsevierViewall">Eccrine spiradenoma is an uncommon&#44; generally benign tumor that originates in the eccrine sweat glands&#46; It generally presents on the trunk of young adults as a single tumor that tends to be painful&#46; The skin may take on a bluish or erythematous tone&#44; as in the present case&#46; Histologically&#44; the tumor is characterized by well-defined nodules with intense cellularity and 2 cell populations&#58; an external population comprising small cells with hyperchromatic nuclei&#44; and an internal population comprising large&#44; pale cells&#46;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">3</span></a></p><p id="par0040" class="elsevierStylePara elsevierViewall">The differential diagnosis of eccrine spiradenoma is very broad and includes inflammatory dermatosis&#44; tumor&#44; and metastasis&#46;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">1</span></a> HRDU can be of value in diagnosis&#46; In the few studies where eccrine spiradenoma has been assessed with ultrasound&#44; the tumor is described as a well-defined hypoechoic or anechoic lobulated image in the dermis or hypodermis&#44; with variable vascular flow and generally peripheral vascularization&#46;<a class="elsevierStyleCrossRefs" href="#bib0065"><span class="elsevierStyleSup">3&#8211;5</span></a> Its location in the dermis-hypodermis enables ultrasound to rule out other painful nodules such as angiolipomas&#44; neurofibromas&#44; neuromas&#44; schwannomas&#44; glomus tumor&#44; endometriomas&#44; and leiomiomas&#44;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">1</span></a> which are generally found in subcutaneous cellular tissue &#40;<a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#41;&#46;<a class="elsevierStyleCrossRefs" href="#bib0060"><span class="elsevierStyleSup">2&#44;6&#8211;8</span></a> The ultrasound-based differential diagnosis should be performed with potentially painful lesions in the dermis-hypodermis such as epidermal cysts&#44; trichilemmal cysts&#44; pilomatricoma&#44; dermatofibroma&#44; hidrocystoma&#44; and schwannoma&#44; without forgetting cutaneous metastases &#40;<a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#41;&#46;<a class="elsevierStyleCrossRefs" href="#bib0060"><span class="elsevierStyleSup">2&#44;6</span></a> It is essential to assess the vascularization of the lesion using Doppler mode&#44; which may help to rule out malignancy with high specificity and sensitivity&#46;<a class="elsevierStyleCrossRef" href="#bib0095"><span class="elsevierStyleSup">9</span></a></p><elsevierMultimedia ident="tbl0005"></elsevierMultimedia><p id="par0045" class="elsevierStylePara elsevierViewall">Curiously&#44; despite being a solid tumor&#44; eccrine spiradenoma may appear as a cystic lesion on ultrasound&#46; Preliminary data suggest that various tumors such schwannomas&#44; leiomyomas&#44; dermatofibromas&#44; dermatofibrosarcoma protuberans&#44; histiocytomas&#44; and eccrine spiradenoma&#44; all of which appear as solid tumors in histopathology&#44; may occasionally present anechoic patterns&#44; with posterior enhancement and even absence of flow in color Doppler&#46; They may also be confused with cysts&#44; thus potentially leading to an erroneous diagnosis&#46;<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">5</span></a> The incidence of solid tumors with cystic ultrasound characteristics was 5&#37; in a series of 430 cases&#46;<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">5</span></a> Lange et al&#46;<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">10</span></a> believe that this could be explained by the histological characteristics of the lesion&#58; the more homogeneous and dense the cell population is&#44; the more likely the lesion is to present as homogeneous&#44; well-defined&#44; and hypoechoic&#44; with posterior enhancement&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">In the case we report&#44; HRDU enabled us to identify an uncommon tumor&#44; eccrine spiradenoma&#44; which is difficult to diagnose&#46; A broad spectrum of tumors&#44; including eccrine spiradenoma&#44; may present clinically as painful nodules and on ultrasound as cysts or pseudocysts&#46; It is essential to evaluate these lesions in both planes&#44; with and without compression&#44; and to assess vascularization in Doppler mode in order to avoid diagnostic and therapeutic errors&#46;</p></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Conflicts of Interest</span><p id="par0055" class="elsevierStylePara elsevierViewall">The authors declare that they have no conflicts of interest&#46;</p></span></span>"
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          "identificador" => "sec0005"
          "titulo" => "Case Description"
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          "identificador" => "sec0015"
          "titulo" => "Conflicts of Interest"
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          "titulo" => "References"
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      0 => array:2 [
        "etiqueta" => "&#9734;"
        "nota" => "<p class="elsevierStyleNotepara" id="npar0005">Please cite this article as&#58; Morgado-Carrasco D&#44; G&#243;mez S&#44; Al&#243;s L&#44; Giavedoni P&#46; Utilidad de la ecograf&#237;a en el diagn&#243;stico diferencial de un n&#243;dulo doloroso en el t&#243;rax&#46; Actas Dermosifiliogr&#46; 2018&#59;109&#58;570&#8211;573&#46;</p>"
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        "figura" => array:1 [
          0 => array:4 [
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          "en" => "<p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">A&#44; Dermatoscopy &#40;DermLite II Pro HR&#44; 3<span class="elsevierStyleHsp" style=""></span>Gen&#41;&#58; central blue-violaceous area surrounded by an erythematous halo&#46; B&#44; Well-differentiated polylobulated tumor in the dermis &#40;hematoxylin-eosin&#44; original magnification<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>2&#41;&#46; C&#44; The tumor is composed of a biphasic epithelial proliferation comprising small cells arranged around cells with more abundant and clearer cytoplasm that forms ductal structures&#46; No atypia or mitosis is visible &#40;hematoxylin-eosin&#44; original magnification<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>20&#41;&#46;</p>"
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      1 => array:7 [
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        "figura" => array:1 [
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          "en" => "<p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">High-resolution ultrasound with a 22-MHz probe &#40;MyLab class C&#44; Esaote&#41; reveals a well-defined polylobulated anechoic image with an internal septum located in the dermis and hypodermis&#46; Positive enhancement was observed&#46; The image measured 11&#46;9<span class="elsevierStyleHsp" style=""></span>mm along its transverse axis &#40;A&#41; and 5&#46;9<span class="elsevierStyleHsp" style=""></span>mm along its longitudinal axis &#40;B&#41;&#46; Power Doppler revealed sparse intralesional vascularization with arterial and venous vessels measuring between 0&#46;2 and 0&#46;4<span class="elsevierStyleHsp" style=""></span>mm in diameter &#40;C&#41;&#46; Spectral Doppler showed that the arterial vessels had a maximum systolic peak of 2&#46;2<span class="elsevierStyleHsp" style=""></span>cm&#47;s &#40;D&#41;&#46;</p>"
        ]
      ]
      2 => array:8 [
        "identificador" => "tbl0005"
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          "leyenda" => "<p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">Source&#58; Echeverr&#237;a-Garc&#237;a et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">2</span></a> Jin et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">3</span></a> Wortsman&#44;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">6</span></a> Stock et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0090"><span class="elsevierStyleSup">8</span></a> and Savelli et al&#46;<a class="elsevierStyleCrossRef" href="#bib0085"><span class="elsevierStyleSup">7</span></a></p>"
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                0 => """
                  <table border="0" frame="\n
                  \t\t\t\t\tvoid\n
                  \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><th class="td" title="table-head  " align="" valign="top" scope="col" style="border-bottom: 2px solid black">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th><th class="td" title="table-head  " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">Location&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th><th class="td" title="table-head  " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">Ultrasound Characteristics in M Mode&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th><th class="td" title="table-head  " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">Characteristics in Color Doppler Mode&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Dermatofibroma&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Dermis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Anechoic or hypoechoic heterogenous and poorly defined oval image&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">No increased vascularization&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Epidermal cyst&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Dermis-hypodermis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Anechoic or hypoechoic round well-defined image&#46; May present bright echoes in its interior &#40;keratin or cholesterol deposits&#41;&#46; Posterior enhancement and lateral acoustic shadows&#46; The punctum &#40;hypoechoic tract connected with the epidermis&#41; is visible&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">No increased vascularization&#44; except for inflammation or rupture&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Trichilemmal cyst&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Dermis or hypodermis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Well-defined round anechoic or hypoechoic image&#46; Linear hyperechoic structures are visible in the interior &#40;follicular debris or calcifications&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Scarce peripheral vascularization&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Pilomatricoma&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Dermis or hypodermis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Well-defined round images with calcifications in the interior&#44; hypoechoic halo on the periphery&#44; posterior acoustic shadow&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Abundant peripheral or internal vascularization&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Hidrocystoma&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Dermis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Well-defined anechoic oval lesion with posterior enhancement&#46; Can compress adjacent muscles&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">No increased vascularization&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Eccrine spiradenoma&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Dermis-hypodermis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Well-defined anechoic or hypoechoic lesion that may be polylobulated&#44; with posterior enhancement&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Increased peripheral vascularization&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Schwannoma&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Dermis-hypodermis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Heterogeneous well-defined anechoic or hypoechoic lesion&#46; Afferent or efferent pathways may be observed&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Generally no increased vascularization&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Metastasis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Dermis-hypodermis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Well-defined hypoechoic or anechoic lesion that may present posterior enhancement&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Increased vascularization&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Glomus tumor&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Hypodermis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Well-defined hypoechoic lesion&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Moderate or abundant vascularization in the interior of the tumor&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Leiomyoma&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Hypodermis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Heterogeneous&#44; hyperechoic&#44; and well-defined image&#44; with a thick capsule that may present calcifications and septa in the interior&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Moderate intratumoral vascularization&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Neuroma&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Hypodermis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Round or oval&#44; generally well-defined hypoechoic lesion&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Generally hypovascular&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Endometrioma&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Hypodermis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Hypoechoic round or oval poorly defined nodular lesion with a hyperechoic halo&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Scarce intratumoral vascularization&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Angiolipoma&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Hypodermis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Heterogeneous&#44; well-defined hyperechoic lesion&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Scarce to moderate intratumoral vascularization&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr></tbody></table>
                  """
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          "en" => "<p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">Differential Diagnosis and Ultrasound Characteristics of Painful Dermal-Hypodermal Lesions&#46;</p>"
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    ]
    "bibliografia" => array:2 [
      "titulo" => "References"
      "seccion" => array:1 [
        0 => array:2 [
          "identificador" => "bibs0015"
          "bibliografiaReferencia" => array:10 [
            0 => array:3 [
              "identificador" => "bib0055"
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              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
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                            1 => "D&#46;M&#46; Trask"
                            2 => "F&#46;H&#46; Watson"
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                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
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                          0 => array:2 [
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                    0 => array:2 [
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              "identificador" => "bib0065"
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Case and Research Letters
Value of Ultrasound as a Diagnostic Tool for a Painful Thoracic Nodule
Utilidad de la ecografía en el diagnóstico diferencial de un nódulo doloroso en el tórax
D. Morgado-Carrascoa, S. Gómeza, L. Alósb, P. Giavedonia,
Autor para correspondencia
giavedonip@gmail.com

Corresponding author.
a Servicio de Dermatología, Hospital Clínic, Universitat de Barcelona, Barcelona, Spain
b Servicios de Anatomía Patológica, Hospital Clínic, Universitat de Barcelona, Barcelona, Spain
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    "titulo" => "Value of Ultrasound as a Diagnostic Tool for a Painful Thoracic Nodule"
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          "en" => "<p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">A&#44; Dermatoscopy &#40;DermLite II Pro HR&#44; 3<span class="elsevierStyleHsp" style=""></span>Gen&#41;&#58; central blue-violaceous area surrounded by an erythematous halo&#46; B&#44; Well-differentiated polylobulated tumor in the dermis &#40;hematoxylin-eosin&#44; original magnification<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>2&#41;&#46; C&#44; The tumor is composed of a biphasic epithelial proliferation comprising small cells arranged around cells with more abundant and clearer cytoplasm that forms ductal structures&#46; No atypia or mitosis is visible &#40;hematoxylin-eosin&#44; original magnification<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>20&#41;&#46;</p>"
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    "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">The clinical diagnosis of painful nodules is difficult owing to the absence of specific clinical characteristics and the large number of differential diagnoses&#46;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">1</span></a> High-resolution Doppler ultrasound &#40;HRDU&#41; is a very valuable tool for the diagnosis and follow-up of multiple neoplastic&#44; vascular&#44; and inflammatory skin diseases&#46;<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">2</span></a></p><p id="par0010" class="elsevierStylePara elsevierViewall">We report the case of a young patient with a painful nodule on the trunk in which HRDU proved useful for evaluation and differential diagnosis&#46;</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Case Description</span><p id="par0015" class="elsevierStylePara elsevierViewall">A 35-year-old man with no relevant medical history consulted for a painful lesion on the left hemithorax that had first appeared 4 months earlier&#46; The lesion grew slowly&#44; and the pain increased over the last 2 months&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">Physical examination revealed a poorly defined and slightly bluish area on the left hemithorax located anteriorly to the axillary midline and a small&#44; soft&#44; mobile&#44; and tender nodule that was difficult to palpate&#46; Dermatoscopy revealed a central blue-violaceous area surrounded by an erythematous halo &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>A&#41;&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0025" class="elsevierStylePara elsevierViewall">HRDU with a 22-MHz probe &#40;MyLab Class C&#44; Esaote&#41; revealed a well-defined anechoic image in the dermis and hypodermis&#46; The image was round in the longitudinal plane and polylobulated in the transverse plane&#46; It was 4&#46;2<span class="elsevierStyleHsp" style=""></span>mm thick and had an internal septum measuring 11&#46;9<span class="elsevierStyleHsp" style=""></span>mm on the transverse axis and 5&#46;9<span class="elsevierStyleHsp" style=""></span>mm on its longitudinal axis&#46; Posterior enhancement was observed&#46; Power Doppler mode revealed sparse intralesional vascularization&#44; with low-flow venous and arterial vessels measuring 0&#46;2 to 0&#46;4<span class="elsevierStyleHsp" style=""></span>mm in diameter&#59; spectral Doppler mode revealed that the arterial vessels had a maximum systolic peak of 2&#46;2<span class="elsevierStyleHsp" style=""></span>cm&#47;s &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>&#41;&#46; The ultrasound characteristics led us to suspect a benign subcutaneous tumor or hematoma&#46; However&#44; given the time since onset and the patient&#39;s symptoms&#44; the tumor margins were determined using ultrasound&#44; and the lesion was surgically removed&#46;</p><elsevierMultimedia ident="fig0010"></elsevierMultimedia><p id="par0030" class="elsevierStylePara elsevierViewall">Histology revealed a well-defined densely cellular tumor in the dermis composed of 2 cell types&#58; small and intensely basophilic cells arranged around other large&#44; pale cells that clustered to form ductal structures &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Figs&#46; 1</a>B and C&#41;&#46; These findings were compatible with a diagnosis of eccrine spiradenoma&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Discussion</span><p id="par0035" class="elsevierStylePara elsevierViewall">Eccrine spiradenoma is an uncommon&#44; generally benign tumor that originates in the eccrine sweat glands&#46; It generally presents on the trunk of young adults as a single tumor that tends to be painful&#46; The skin may take on a bluish or erythematous tone&#44; as in the present case&#46; Histologically&#44; the tumor is characterized by well-defined nodules with intense cellularity and 2 cell populations&#58; an external population comprising small cells with hyperchromatic nuclei&#44; and an internal population comprising large&#44; pale cells&#46;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">3</span></a></p><p id="par0040" class="elsevierStylePara elsevierViewall">The differential diagnosis of eccrine spiradenoma is very broad and includes inflammatory dermatosis&#44; tumor&#44; and metastasis&#46;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">1</span></a> HRDU can be of value in diagnosis&#46; In the few studies where eccrine spiradenoma has been assessed with ultrasound&#44; the tumor is described as a well-defined hypoechoic or anechoic lobulated image in the dermis or hypodermis&#44; with variable vascular flow and generally peripheral vascularization&#46;<a class="elsevierStyleCrossRefs" href="#bib0065"><span class="elsevierStyleSup">3&#8211;5</span></a> Its location in the dermis-hypodermis enables ultrasound to rule out other painful nodules such as angiolipomas&#44; neurofibromas&#44; neuromas&#44; schwannomas&#44; glomus tumor&#44; endometriomas&#44; and leiomiomas&#44;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">1</span></a> which are generally found in subcutaneous cellular tissue &#40;<a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#41;&#46;<a class="elsevierStyleCrossRefs" href="#bib0060"><span class="elsevierStyleSup">2&#44;6&#8211;8</span></a> The ultrasound-based differential diagnosis should be performed with potentially painful lesions in the dermis-hypodermis such as epidermal cysts&#44; trichilemmal cysts&#44; pilomatricoma&#44; dermatofibroma&#44; hidrocystoma&#44; and schwannoma&#44; without forgetting cutaneous metastases &#40;<a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#41;&#46;<a class="elsevierStyleCrossRefs" href="#bib0060"><span class="elsevierStyleSup">2&#44;6</span></a> It is essential to assess the vascularization of the lesion using Doppler mode&#44; which may help to rule out malignancy with high specificity and sensitivity&#46;<a class="elsevierStyleCrossRef" href="#bib0095"><span class="elsevierStyleSup">9</span></a></p><elsevierMultimedia ident="tbl0005"></elsevierMultimedia><p id="par0045" class="elsevierStylePara elsevierViewall">Curiously&#44; despite being a solid tumor&#44; eccrine spiradenoma may appear as a cystic lesion on ultrasound&#46; Preliminary data suggest that various tumors such schwannomas&#44; leiomyomas&#44; dermatofibromas&#44; dermatofibrosarcoma protuberans&#44; histiocytomas&#44; and eccrine spiradenoma&#44; all of which appear as solid tumors in histopathology&#44; may occasionally present anechoic patterns&#44; with posterior enhancement and even absence of flow in color Doppler&#46; They may also be confused with cysts&#44; thus potentially leading to an erroneous diagnosis&#46;<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">5</span></a> The incidence of solid tumors with cystic ultrasound characteristics was 5&#37; in a series of 430 cases&#46;<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">5</span></a> Lange et al&#46;<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">10</span></a> believe that this could be explained by the histological characteristics of the lesion&#58; the more homogeneous and dense the cell population is&#44; the more likely the lesion is to present as homogeneous&#44; well-defined&#44; and hypoechoic&#44; with posterior enhancement&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">In the case we report&#44; HRDU enabled us to identify an uncommon tumor&#44; eccrine spiradenoma&#44; which is difficult to diagnose&#46; A broad spectrum of tumors&#44; including eccrine spiradenoma&#44; may present clinically as painful nodules and on ultrasound as cysts or pseudocysts&#46; It is essential to evaluate these lesions in both planes&#44; with and without compression&#44; and to assess vascularization in Doppler mode in order to avoid diagnostic and therapeutic errors&#46;</p></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Conflicts of Interest</span><p id="par0055" class="elsevierStylePara elsevierViewall">The authors declare that they have no conflicts of interest&#46;</p></span></span>"
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        "nota" => "<p class="elsevierStyleNotepara" id="npar0005">Please cite this article as&#58; Morgado-Carrasco D&#44; G&#243;mez S&#44; Al&#243;s L&#44; Giavedoni P&#46; Utilidad de la ecograf&#237;a en el diagn&#243;stico diferencial de un n&#243;dulo doloroso en el t&#243;rax&#46; Actas Dermosifiliogr&#46; 2018&#59;109&#58;570&#8211;573&#46;</p>"
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          "en" => "<p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">A&#44; Dermatoscopy &#40;DermLite II Pro HR&#44; 3<span class="elsevierStyleHsp" style=""></span>Gen&#41;&#58; central blue-violaceous area surrounded by an erythematous halo&#46; B&#44; Well-differentiated polylobulated tumor in the dermis &#40;hematoxylin-eosin&#44; original magnification<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>2&#41;&#46; C&#44; The tumor is composed of a biphasic epithelial proliferation comprising small cells arranged around cells with more abundant and clearer cytoplasm that forms ductal structures&#46; No atypia or mitosis is visible &#40;hematoxylin-eosin&#44; original magnification<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>20&#41;&#46;</p>"
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          "leyenda" => "<p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">Source&#58; Echeverr&#237;a-Garc&#237;a et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">2</span></a> Jin et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">3</span></a> Wortsman&#44;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">6</span></a> Stock et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib0090"><span class="elsevierStyleSup">8</span></a> and Savelli et al&#46;<a class="elsevierStyleCrossRef" href="#bib0085"><span class="elsevierStyleSup">7</span></a></p>"
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                  <table border="0" frame="\n
                  \t\t\t\t\tvoid\n
                  \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><th class="td" title="table-head  " align="" valign="top" scope="col" style="border-bottom: 2px solid black">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th><th class="td" title="table-head  " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">Location&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th><th class="td" title="table-head  " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">Ultrasound Characteristics in M Mode&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th><th class="td" title="table-head  " align="left" valign="top" scope="col" style="border-bottom: 2px solid black">Characteristics in Color Doppler Mode&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Dermatofibroma&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Dermis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Anechoic or hypoechoic heterogenous and poorly defined oval image&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">No increased vascularization&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Epidermal cyst&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Dermis-hypodermis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Anechoic or hypoechoic round well-defined image&#46; May present bright echoes in its interior &#40;keratin or cholesterol deposits&#41;&#46; Posterior enhancement and lateral acoustic shadows&#46; The punctum &#40;hypoechoic tract connected with the epidermis&#41; is visible&#46;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">No increased vascularization&#44; except for inflammation or rupture&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Trichilemmal cyst&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Dermis or hypodermis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Well-defined round anechoic or hypoechoic image&#46; Linear hyperechoic structures are visible in the interior &#40;follicular debris or calcifications&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Scarce peripheral vascularization&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Pilomatricoma&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Dermis or hypodermis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Well-defined round images with calcifications in the interior&#44; hypoechoic halo on the periphery&#44; posterior acoustic shadow&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Abundant peripheral or internal vascularization&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Hidrocystoma&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Dermis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Well-defined anechoic oval lesion with posterior enhancement&#46; Can compress adjacent muscles&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">No increased vascularization&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Eccrine spiradenoma&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Dermis-hypodermis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Well-defined anechoic or hypoechoic lesion that may be polylobulated&#44; with posterior enhancement&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Increased peripheral vascularization&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Schwannoma&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Dermis-hypodermis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Heterogeneous well-defined anechoic or hypoechoic lesion&#46; Afferent or efferent pathways may be observed&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Generally no increased vascularization&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Metastasis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Dermis-hypodermis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Well-defined hypoechoic or anechoic lesion that may present posterior enhancement&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Increased vascularization&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Glomus tumor&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Hypodermis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Well-defined hypoechoic lesion&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Moderate or abundant vascularization in the interior of the tumor&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Leiomyoma&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Hypodermis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Heterogeneous&#44; hyperechoic&#44; and well-defined image&#44; with a thick capsule that may present calcifications and septa in the interior&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Moderate intratumoral vascularization&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Neuroma&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Hypodermis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Round or oval&#44; generally well-defined hypoechoic lesion&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Generally hypovascular&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Endometrioma&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Hypodermis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Hypoechoic round or oval poorly defined nodular lesion with a hyperechoic halo&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Scarce intratumoral vascularization&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="table-entry ; entry_with_role_rowhead " align="left" valign="top">Angiolipoma&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Hypodermis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Heterogeneous&#44; well-defined hyperechoic lesion&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="left" valign="top">Scarce to moderate intratumoral vascularization&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr></tbody></table>
                  """
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