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sin antecedentes personales de inter&#233;s&#44; consult&#243; por una p&#225;pula de 0&#44;2<span class="elsevierStyleHsp" style=""></span>cm de di&#225;metro de 2 a&#241;os de evoluci&#243;n situada en el flanco derecho&#44; ligeramente eritematosa y dolorosa&#46; No asociaba signos de sangrado ni crecimiento&#46; Se plante&#243; el diagn&#243;stico cl&#237;nico de angioleiomioma y angiolipoma y se realiz&#243; biopsia escisional de la lesi&#243;n&#46;</p><p id="par0015" class="elsevierStylePara elsevierViewall">Histol&#243;gicamente se observ&#243; una lesi&#243;n sobreelevada&#44; s&#233;sil&#44; debido a la presencia de una neoformaci&#243;n nodular&#44; s&#243;lida&#44; bien circunscrita&#44; de contornos lobulados&#44; situada en el tercio superficial de la dermis reticular &#40;<a class="elsevierStyleCrossRef" href="#fig0005">fig&#46; 1</a>A&#41;&#46; Estaba constituida por c&#233;lulas fusiformes y epitelioides&#44; de n&#250;cleo oval o redondeado&#44; sin atipia significativa&#44; citoplasma en cantidad variable&#44; de l&#237;mites mal definidos y sin pr&#225;cticamente componente intersticial &#40;<a class="elsevierStyleCrossRef" href="#fig0005">figs&#46; 1</a>B-D&#41;&#46; Se apreci&#243; un m&#225;ximo de 4 figuras mit&#243;ticas por 10 campos a 40&#215;&#46; No se observ&#243; necrosis tumoral&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0020" class="elsevierStylePara elsevierViewall">La poblaci&#243;n tumoral mostr&#243; inmunotinci&#243;n difusa y generalizada para S-100 y EMA &#40;<a class="elsevierStyleCrossRef" href="#fig0010">fig&#46; 2</a>&#41;&#44; siendo focal para actina muscular lisa &#40;<a class="elsevierStyleCrossRef" href="#fig0015">figs&#46; 3</a>C&#44;D&#41; y caldesm&#243;n&#46; No se observ&#243; inmunotinci&#243;n para citoqueratinas AE1-AE3 &#40;<a class="elsevierStyleCrossRef" href="#fig0015">figs&#46; 3</a>A&#44;B&#41;&#44; melan-A&#44; desmina&#44; prote&#237;na gliofibrilar &#225;cida&#44; p63&#44; ni claudina-1&#46;</p><elsevierMultimedia ident="fig0010"></elsevierMultimedia><elsevierMultimedia ident="fig0015"></elsevierMultimedia><p id="par0025" class="elsevierStylePara elsevierViewall">Se estudi&#243; mediante RT-PCR y secuenciaci&#243;n de los reordenamientos EWSR1 &#40;EWSR1-POUF5F1&#44; EWSR1-ZNF444 y EWSR1-PBX1&#41;<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">5</span></a> con resultado negativo&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">El mioepitelioma sincitial es un tumor raro&#44; present&#225;ndose cl&#237;nicamente como una p&#225;pula o n&#243;dulo en extremidades de varones de mediana edad&#46; Histol&#243;gicamente se caracteriza por ser un tumor s&#243;lido de c&#233;lulas fusiformes o histocitoides de citoplasma eosin&#243;filo p&#225;lido y n&#250;cleo vesicular&#44; con estroma escaso<a class="elsevierStyleCrossRefs" href="#bib0075"><span class="elsevierStyleSup">5&#44;6</span></a>&#46;</p><p id="par0035" class="elsevierStylePara elsevierViewall">Habitualmente no presenta mitosis&#44; necrosis e invasi&#243;n linfovascular&#44; pero excepcionalmente se han descrito hasta 4 figuras mit&#243;ticas por 10 campos a 40&#215;<a class="elsevierStyleCrossRef" href="#bib0085"><span class="elsevierStyleSup">7</span></a>&#46; Los criterios diagn&#243;sticos del carcinoma mioepitelial cut&#225;neo no est&#225;n bien establecidos&#44; pero los tumores con atipia citol&#243;gica marcada&#44; un alto &#237;ndice mit&#243;tico y necrosis muestran un comportamiento m&#225;s agresivo&#44; con incremento de la probabilidad de recidiva y met&#225;stasis a distancia<a class="elsevierStyleCrossRefs" href="#bib0075"><span class="elsevierStyleSup">5&#44;7-9</span></a>&#46;</p><p id="par0040" class="elsevierStylePara elsevierViewall">El 50&#37; de los mioepiteliomas sincitiales cut&#225;neos presentan un reordenamiento del gen EWSR1<a class="elsevierStyleCrossRefs" href="#bib0070"><span class="elsevierStyleSup">4&#44;5&#44;7</span></a>&#46;</p><p id="par0045" class="elsevierStylePara elsevierViewall">Los tumores mioepiteliales suelen expresar citoqueratinas y la prote&#237;na S100&#46; No obstante&#44; el mioepitelioma sincitial presenta inmunotinci&#243;n para EMA y prote&#237;na S100&#44; y la mayor&#237;a son negativos para citoqueratinas<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">5</span></a>&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">El diagn&#243;stico diferencial incluye el histiocitioma fibroso benigno epitelioide&#44; el xantogranuloma juvenil&#44; lesiones melanoc&#237;ticas y el sarcoma epitelioide<a class="elsevierStyleCrossRefs" href="#bib0075"><span class="elsevierStyleSup">5&#44;9</span></a>&#46;</p><p id="par0055" class="elsevierStylePara elsevierViewall">El histiocitioma fibroso benigno epitelioide se presenta como un n&#243;dulo d&#233;rmico de c&#233;lulas epitelioides&#44; con presencia frecuente de binucleaci&#243;n&#44; positivas para EMA&#44; en el seno de un estroma fibrovascular&#46; No obstante&#44; esta lesi&#243;n no presenta una arquitectura sincitial ni la inmunotinci&#243;n para la prote&#237;na S100&#44; ni para PAGF y p63&#44; como ocurre con el mioepitelioma sincitial<a class="elsevierStyleCrossRefs" href="#bib0070"><span class="elsevierStyleSup">4&#44;7&#44;9</span></a>&#46;</p><p id="par0060" class="elsevierStylePara elsevierViewall">En su fase precoz&#44; el xantogranuloma juvenil se presenta como una lesi&#243;n exof&#237;tica de histiocitos eosin&#243;filos que no suele presentar c&#233;lulas lipidizadas mononucleadas o multinucleadas &#40;c&#233;lulas de Touton&#41;<a class="elsevierStyleCrossRef" href="#bib0095"><span class="elsevierStyleSup">9</span></a>&#46; No obstante&#44; suele afectar a ni&#241;os&#44; muestra inmunotinci&#243;n para CD163&#44; CD68 y negatividad para EMA y la prote&#237;na S100<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">4</span></a>&#46;</p><p id="par0065" class="elsevierStylePara elsevierViewall">El mioepitelioma sincitial cut&#225;neo se constituye por una combinaci&#243;n de c&#233;lulas epitelioides&#44; histocitoides y fusiformes&#46; En la histolog&#237;a del nevus de Spitz se objetivan nidos de c&#233;lulas melanoc&#237;ticas con frecuente maduraci&#243;n descendente y sin patr&#243;n arquitectural sincitial&#46; Ambas neoplasias son positivas para S100&#44; pero la positividad para Melan A&#44; HMB-45 y MiTF&#44; as&#237; como la negatividad para EMA y PAGF&#44; favorece el diagn&#243;stico de nevus de Spitz<a class="elsevierStyleCrossRefs" href="#bib0070"><span class="elsevierStyleSup">4&#44;5&#44;7&#44;9</span></a>&#46;</p><p id="par0070" class="elsevierStylePara elsevierViewall">El sarcoma epitelioide suele presentar una combinaci&#243;n de c&#233;lulas epitelioides y fusiformes con atipia celular y crecimiento infiltrativo con frecuentes n&#243;dulos sat&#233;lites&#46; No obstante&#44; en algunos casos se presenta con un patr&#243;n con atipia leve&#46; Ambas lesiones son positivas para EMA&#44; pero el sarcoma epitelioide es positivo para citoqueratinas y CD34&#44; es negativo para los marcadores mioepiteliales como la prote&#237;na S100 y GFAP&#44; y presenta frecuentemente p&#233;rdida de inmunotinci&#243;n para INI-1<a class="elsevierStyleCrossRefs" href="#bib0075"><span class="elsevierStyleSup">5&#44;7&#44;9</span></a>&#46;</p><p id="par0075" class="elsevierStylePara elsevierViewall">El diagn&#243;stico diferencial de una lesi&#243;n tumoral cut&#225;nea dolorosa incluye angiolipomas&#44; neuromas&#44; tumor gl&#243;mico&#44; schwannoma&#44; leiomioma&#44; espiradenoma ecrino y dermatofibroma<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">10</span></a>&#46;</p><p id="par0080" class="elsevierStylePara elsevierViewall">El tratamiento de los mioepiteliomas cut&#225;neos sincitiales se basa en la ex&#233;resis amplia&#46; Nuestro paciente present&#243; buena evoluci&#243;n sin evidencia de recurrencia local ni met&#225;stasis en los controles posteriores&#44; en consonancia con lo descrito en la literatura<a class="elsevierStyleCrossRefs" href="#bib0070"><span class="elsevierStyleSup">4&#44;9</span></a>&#46;</p><p id="par0085" class="elsevierStylePara elsevierViewall">Como conclusi&#243;n&#44; presentamos un caso de un mioepitelioma sincitial cut&#225;neo doloroso&#46; Es un tumor d&#233;rmico benigno muy raro&#46; Su cl&#237;nica es inespec&#237;fica&#44; y para su diagn&#243;stico es fundamental la realizaci&#243;n de un examen histopatol&#243;gico y un panel inmunohistoqu&#237;mico completo para diferenciarlo de otras lesiones asociadas a un peor pron&#243;stico&#46; La presencia del reordenamiento del gen EWSR1 puede ayudar al diagn&#243;stico&#46; El tratamiento se basa en la ex&#233;resis amplia de la lesi&#243;n&#44; con un pron&#243;stico excelente&#46;</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Conflicto de intereses</span><p id="par0090" class="elsevierStylePara elsevierViewall">Los autores declaran no tener ning&#250;n conflicto de intereses&#46;</p></span></span>"
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                          "etal" => false
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                            1 => "F&#46; Facchin"
                            2 => "E&#46; Kohlscheen"
                            3 => "L&#46; Sartore"
                            4 => "R&#46; Salmaso"
                            5 => "F&#46; Bassetto"
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                      "doi" => "10.1016/j.prp.2016.07.013"
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                        "fecha" => "2016"
                        "volumen" => "212"
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                  "contribucion" => array:1 [
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                      "titulo" => "Cutaneous syncytial myoepithelioma&#58; clinicopathologic characterization in a series of 38 series"
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                        0 => array:2 [
                          "etal" => false
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                            1 => "C&#46;R&#46; Antonescu"
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                    0 => array:2 [
                      "titulo" => "Myoepithelioma&#46; Section 3&#58; Tumor and pseudotumors of the skin and subcutis&#46; Chapter 11&#58; Adnexal tumors"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => false
                          "autores" => array:4 [
                            0 => "V&#46;G&#46; Prieto"
                            1 => "C&#46;R&#46; Shea"
                            2 => "J&#46;T&#46; Celebi"
                            3 => "K&#46;J&#46; Busam"
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                    0 => array:1 [
                      "LibroEditado" => array:6 [
                        "editores" => "J&#46;K&#46;Busam"
                        "titulo" => "Dermatopathology&#46; A Volume in the Series&#58; Foundations in Diagnostic Pathology"
                        "paginaInicial" => "418"
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                        "edicion" => "2nd ed&#46;"
                        "serieFecha" => "2015"
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                      "titulo" => "Cutaneous syncytial myoepithelioma&#58; a case report with emphasis on the differential diagnosis of problematic dermal tumors"
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                        0 => array:2 [
                          "etal" => false
                          "autores" => array:5 [
                            0 => "J&#46;H&#46; Lee"
                            1 => "H&#46;Y&#46; Huang"
                            2 => "J&#46; Lan"
                            3 => "C&#46;C&#46; Hwang"
                            4 => "C&#46;Y&#46; Liu"
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                      "doi" => "10.3892/ol.2015.3055"
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                        "tituloSerie" => "Oncol Lett&#46;"
                        "fecha" => "2015"
                        "volumen" => "9"
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                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "A case of cutaneous myoepithelial carcinoma"
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                        0 => array:2 [
                          "etal" => false
                          "autores" => array:6 [
                            0 => "J&#46; Tanahashi"
                            1 => "K&#46; Kashima"
                            2 => "T&#46; Daa"
                            3 => "Y&#46; Kondo"
                            4 => "E&#46; Kuratomi"
                            5 => "S&#46; Yokoyama"
                          ]
                        ]
                      ]
                    ]
                  ]
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                    0 => array:2 [
                      "doi" => "10.1111/j.1600-0560.2006.00676.x"
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                        "fecha" => "2007"
                        "volumen" => "34"
                        "paginaInicial" => "648"
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              "etiqueta" => "9"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "Cutaneous syncitial myoepithelioma&#46; A recently described neoplasm which may mimic nevoid melanoma and epithelioid sarcoma"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => false
                          "autores" => array:5 [
                            0 => "A&#46;K&#46; Alomari"
                            1 => "N&#46; Brown"
                            2 => "A&#46;A&#46; Andea"
                            3 => "B&#46;L&#46; Betz"
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                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
                    0 => array:2 [
                      "doi" => "10.1111/cup.13005"
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Carta científico-clínica
Mioepitelioma sincitial cutáneo doloroso: desde la clínica inespecífica al diagnóstico histopatológico
Painful Cutaneous Syncytial Myoepithelioma: From Nonspecific Symptoms to Histopathologic Diagnosis
S. Guillen-Climenta,
Corresponding author
santigc85@gmail.com

Autor para correspondencia.
, B. Vazqueza, M.I. Pinazoa, C. Monteagudob,c
a Servicio de Dermatología, Hospital Clínico Universitario, Valencia, España
b Servicio de Anatomía Patológica, Hospital Clínico Universitario, Valencia, España
c Departamento de Patología, Facultad de Medicina, Universidad de Valencia, Valencia, España
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    "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">Los tumores con diferenciaci&#243;n mioepitelial incluyen el tumor mixto&#44; el mioepitelioma y el carcinoma mioepitelial&#46; Suelen afectar a las gl&#225;ndulas salivales&#44; aunque pueden localizarse tambi&#233;n en el &#225;rea nasosinusal&#44; laringe&#44; pulm&#243;n y piel&#46; Las neoplasias cut&#225;neas con diferenciaci&#243;n mioepitelial incluyen el siringoma condroide &#40;tumor mixto&#41;&#44; el mioepitelioma cut&#225;neo&#44; el siringoma condroide maligno y el carcinoma mioepitelial<a class="elsevierStyleCrossRefs" href="#bib0055"><span class="elsevierStyleSup">1-3</span></a>&#46; En los &#250;ltimos a&#241;os se ha descrito la variante sincitial del mioepitelioma cut&#225;neo<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">4</span></a>&#46;</p><p id="par0010" class="elsevierStylePara elsevierViewall">Un var&#243;n de 33 a&#241;os&#44; sin antecedentes personales de inter&#233;s&#44; consult&#243; por una p&#225;pula de 0&#44;2<span class="elsevierStyleHsp" style=""></span>cm de di&#225;metro de 2 a&#241;os de evoluci&#243;n situada en el flanco derecho&#44; ligeramente eritematosa y dolorosa&#46; No asociaba signos de sangrado ni crecimiento&#46; Se plante&#243; el diagn&#243;stico cl&#237;nico de angioleiomioma y angiolipoma y se realiz&#243; biopsia escisional de la lesi&#243;n&#46;</p><p id="par0015" class="elsevierStylePara elsevierViewall">Histol&#243;gicamente se observ&#243; una lesi&#243;n sobreelevada&#44; s&#233;sil&#44; debido a la presencia de una neoformaci&#243;n nodular&#44; s&#243;lida&#44; bien circunscrita&#44; de contornos lobulados&#44; situada en el tercio superficial de la dermis reticular &#40;<a class="elsevierStyleCrossRef" href="#fig0005">fig&#46; 1</a>A&#41;&#46; Estaba constituida por c&#233;lulas fusiformes y epitelioides&#44; de n&#250;cleo oval o redondeado&#44; sin atipia significativa&#44; citoplasma en cantidad variable&#44; de l&#237;mites mal definidos y sin pr&#225;cticamente componente intersticial &#40;<a class="elsevierStyleCrossRef" href="#fig0005">figs&#46; 1</a>B-D&#41;&#46; Se apreci&#243; un m&#225;ximo de 4 figuras mit&#243;ticas por 10 campos a 40&#215;&#46; No se observ&#243; necrosis tumoral&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0020" class="elsevierStylePara elsevierViewall">La poblaci&#243;n tumoral mostr&#243; inmunotinci&#243;n difusa y generalizada para S-100 y EMA &#40;<a class="elsevierStyleCrossRef" href="#fig0010">fig&#46; 2</a>&#41;&#44; siendo focal para actina muscular lisa &#40;<a class="elsevierStyleCrossRef" href="#fig0015">figs&#46; 3</a>C&#44;D&#41; y caldesm&#243;n&#46; No se observ&#243; inmunotinci&#243;n para citoqueratinas AE1-AE3 &#40;<a class="elsevierStyleCrossRef" href="#fig0015">figs&#46; 3</a>A&#44;B&#41;&#44; melan-A&#44; desmina&#44; prote&#237;na gliofibrilar &#225;cida&#44; p63&#44; ni claudina-1&#46;</p><elsevierMultimedia ident="fig0010"></elsevierMultimedia><elsevierMultimedia ident="fig0015"></elsevierMultimedia><p id="par0025" class="elsevierStylePara elsevierViewall">Se estudi&#243; mediante RT-PCR y secuenciaci&#243;n de los reordenamientos EWSR1 &#40;EWSR1-POUF5F1&#44; EWSR1-ZNF444 y EWSR1-PBX1&#41;<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">5</span></a> con resultado negativo&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">El mioepitelioma sincitial es un tumor raro&#44; present&#225;ndose cl&#237;nicamente como una p&#225;pula o n&#243;dulo en extremidades de varones de mediana edad&#46; Histol&#243;gicamente se caracteriza por ser un tumor s&#243;lido de c&#233;lulas fusiformes o histocitoides de citoplasma eosin&#243;filo p&#225;lido y n&#250;cleo vesicular&#44; con estroma escaso<a class="elsevierStyleCrossRefs" href="#bib0075"><span class="elsevierStyleSup">5&#44;6</span></a>&#46;</p><p id="par0035" class="elsevierStylePara elsevierViewall">Habitualmente no presenta mitosis&#44; necrosis e invasi&#243;n linfovascular&#44; pero excepcionalmente se han descrito hasta 4 figuras mit&#243;ticas por 10 campos a 40&#215;<a class="elsevierStyleCrossRef" href="#bib0085"><span class="elsevierStyleSup">7</span></a>&#46; Los criterios diagn&#243;sticos del carcinoma mioepitelial cut&#225;neo no est&#225;n bien establecidos&#44; pero los tumores con atipia citol&#243;gica marcada&#44; un alto &#237;ndice mit&#243;tico y necrosis muestran un comportamiento m&#225;s agresivo&#44; con incremento de la probabilidad de recidiva y met&#225;stasis a distancia<a class="elsevierStyleCrossRefs" href="#bib0075"><span class="elsevierStyleSup">5&#44;7-9</span></a>&#46;</p><p id="par0040" class="elsevierStylePara elsevierViewall">El 50&#37; de los mioepiteliomas sincitiales cut&#225;neos presentan un reordenamiento del gen EWSR1<a class="elsevierStyleCrossRefs" href="#bib0070"><span class="elsevierStyleSup">4&#44;5&#44;7</span></a>&#46;</p><p id="par0045" class="elsevierStylePara elsevierViewall">Los tumores mioepiteliales suelen expresar citoqueratinas y la prote&#237;na S100&#46; No obstante&#44; el mioepitelioma sincitial presenta inmunotinci&#243;n para EMA y prote&#237;na S100&#44; y la mayor&#237;a son negativos para citoqueratinas<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">5</span></a>&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">El diagn&#243;stico diferencial incluye el histiocitioma fibroso benigno epitelioide&#44; el xantogranuloma juvenil&#44; lesiones melanoc&#237;ticas y el sarcoma epitelioide<a class="elsevierStyleCrossRefs" href="#bib0075"><span class="elsevierStyleSup">5&#44;9</span></a>&#46;</p><p id="par0055" class="elsevierStylePara elsevierViewall">El histiocitioma fibroso benigno epitelioide se presenta como un n&#243;dulo d&#233;rmico de c&#233;lulas epitelioides&#44; con presencia frecuente de binucleaci&#243;n&#44; positivas para EMA&#44; en el seno de un estroma fibrovascular&#46; No obstante&#44; esta lesi&#243;n no presenta una arquitectura sincitial ni la inmunotinci&#243;n para la prote&#237;na S100&#44; ni para PAGF y p63&#44; como ocurre con el mioepitelioma sincitial<a class="elsevierStyleCrossRefs" href="#bib0070"><span class="elsevierStyleSup">4&#44;7&#44;9</span></a>&#46;</p><p id="par0060" class="elsevierStylePara elsevierViewall">En su fase precoz&#44; el xantogranuloma juvenil se presenta como una lesi&#243;n exof&#237;tica de histiocitos eosin&#243;filos que no suele presentar c&#233;lulas lipidizadas mononucleadas o multinucleadas &#40;c&#233;lulas de Touton&#41;<a class="elsevierStyleCrossRef" href="#bib0095"><span class="elsevierStyleSup">9</span></a>&#46; No obstante&#44; suele afectar a ni&#241;os&#44; muestra inmunotinci&#243;n para CD163&#44; CD68 y negatividad para EMA y la prote&#237;na S100<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">4</span></a>&#46;</p><p id="par0065" class="elsevierStylePara elsevierViewall">El mioepitelioma sincitial cut&#225;neo se constituye por una combinaci&#243;n de c&#233;lulas epitelioides&#44; histocitoides y fusiformes&#46; En la histolog&#237;a del nevus de Spitz se objetivan nidos de c&#233;lulas melanoc&#237;ticas con frecuente maduraci&#243;n descendente y sin patr&#243;n arquitectural sincitial&#46; Ambas neoplasias son positivas para S100&#44; pero la positividad para Melan A&#44; HMB-45 y MiTF&#44; as&#237; como la negatividad para EMA y PAGF&#44; favorece el diagn&#243;stico de nevus de Spitz<a class="elsevierStyleCrossRefs" href="#bib0070"><span class="elsevierStyleSup">4&#44;5&#44;7&#44;9</span></a>&#46;</p><p id="par0070" class="elsevierStylePara elsevierViewall">El sarcoma epitelioide suele presentar una combinaci&#243;n de c&#233;lulas epitelioides y fusiformes con atipia celular y crecimiento infiltrativo con frecuentes n&#243;dulos sat&#233;lites&#46; No obstante&#44; en algunos casos se presenta con un patr&#243;n con atipia leve&#46; Ambas lesiones son positivas para EMA&#44; pero el sarcoma epitelioide es positivo para citoqueratinas y CD34&#44; es negativo para los marcadores mioepiteliales como la prote&#237;na S100 y GFAP&#44; y presenta frecuentemente p&#233;rdida de inmunotinci&#243;n para INI-1<a class="elsevierStyleCrossRefs" href="#bib0075"><span class="elsevierStyleSup">5&#44;7&#44;9</span></a>&#46;</p><p id="par0075" class="elsevierStylePara elsevierViewall">El diagn&#243;stico diferencial de una lesi&#243;n tumoral cut&#225;nea dolorosa incluye angiolipomas&#44; neuromas&#44; tumor gl&#243;mico&#44; schwannoma&#44; leiomioma&#44; espiradenoma ecrino y dermatofibroma<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">10</span></a>&#46;</p><p id="par0080" class="elsevierStylePara elsevierViewall">El tratamiento de los mioepiteliomas cut&#225;neos sincitiales se basa en la ex&#233;resis amplia&#46; Nuestro paciente present&#243; buena evoluci&#243;n sin evidencia de recurrencia local ni met&#225;stasis en los controles posteriores&#44; en consonancia con lo descrito en la literatura<a class="elsevierStyleCrossRefs" href="#bib0070"><span class="elsevierStyleSup">4&#44;9</span></a>&#46;</p><p id="par0085" class="elsevierStylePara elsevierViewall">Como conclusi&#243;n&#44; presentamos un caso de un mioepitelioma sincitial cut&#225;neo doloroso&#46; Es un tumor d&#233;rmico benigno muy raro&#46; Su cl&#237;nica es inespec&#237;fica&#44; y para su diagn&#243;stico es fundamental la realizaci&#243;n de un examen histopatol&#243;gico y un panel inmunohistoqu&#237;mico completo para diferenciarlo de otras lesiones asociadas a un peor pron&#243;stico&#46; La presencia del reordenamiento del gen EWSR1 puede ayudar al diagn&#243;stico&#46; El tratamiento se basa en la ex&#233;resis amplia de la lesi&#243;n&#44; con un pron&#243;stico excelente&#46;</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Conflicto de intereses</span><p id="par0090" class="elsevierStylePara elsevierViewall">Los autores declaran no tener ning&#250;n conflicto de intereses&#46;</p></span></span>"
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                            2 => "E&#46; Kohlscheen"
                            3 => "L&#46; Sartore"
                            4 => "R&#46; Salmaso"
                            5 => "F&#46; Bassetto"
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                    0 => array:2 [
                      "titulo" => "Myoepithelioma&#46; Section 3&#58; Tumor and pseudotumors of the skin and subcutis&#46; Chapter 11&#58; Adnexal tumors"
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                        0 => array:2 [
                          "etal" => false
                          "autores" => array:4 [
                            0 => "V&#46;G&#46; Prieto"
                            1 => "C&#46;R&#46; Shea"
                            2 => "J&#46;T&#46; Celebi"
                            3 => "K&#46;J&#46; Busam"
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                        "titulo" => "Dermatopathology&#46; A Volume in the Series&#58; Foundations in Diagnostic Pathology"
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                      "titulo" => "Cutaneous syncytial myoepithelioma&#58; a case report with emphasis on the differential diagnosis of problematic dermal tumors"
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                          "etal" => false
                          "autores" => array:5 [
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                            2 => "J&#46; Lan"
                            3 => "C&#46;C&#46; Hwang"
                            4 => "C&#46;Y&#46; Liu"
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                        "volumen" => "9"
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                    0 => array:2 [
                      "titulo" => "A case of cutaneous myoepithelial carcinoma"
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                        0 => array:2 [
                          "etal" => false
                          "autores" => array:6 [
                            0 => "J&#46; Tanahashi"
                            1 => "K&#46; Kashima"
                            2 => "T&#46; Daa"
                            3 => "Y&#46; Kondo"
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Article information
ISSN: 00017310
Original language: Spanish
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