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Image courtesy of Dr. Eiras (Department of Immunology of the University Hospital Complex of Santiago de Compostela).</p>" ] ] ] "autores" => array:1 [ 0 => array:2 [ "autoresLista" => "N. Moreiras Arias, M.E. Rosón López, J.M. Suárez Peñaranda, H.A. Vázquez Veiga" "autores" => array:4 [ 0 => array:2 [ "nombre" => "N." "apellidos" => "Moreiras Arias" ] 1 => array:2 [ "nombre" => "M.E." "apellidos" => "Rosón López" ] 2 => array:2 [ "nombre" => "J.M." "apellidos" => "Suárez Peñaranda" ] 3 => array:2 [ "nombre" => "H.A." 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"apellidos" => "Linares-Barrios" ] ] ] ] ] "idiomaDefecto" => "en" "Traduccion" => array:1 [ "es" => array:9 [ "pii" => "S0001731021000958" "doi" => "10.1016/j.ad.2020.01.010" "estado" => "S300" "subdocumento" => "" "abierto" => array:3 [ "ES" => true "ES2" => true "LATM" => true ] "gratuito" => true "lecturas" => array:1 [ "total" => 0 ] "idiomaDefecto" => "es" "EPUB" => "https://multimedia.elsevier.es/PublicationsMultimediaV1/item/epub/S0001731021000958?idApp=UINPBA000044" ] ] "EPUB" => "https://multimedia.elsevier.es/PublicationsMultimediaV1/item/epub/S1578219021002298?idApp=UINPBA000044" "url" => "/15782190/0000011200000009/v1_202110091021/S1578219021002298/v1_202110091021/en/main.assets" ] "en" => array:16 [ "idiomaDefecto" => true "cabecera" => "<span class="elsevierStyleTextfn">Case and Research Letters</span>" "titulo" => "Retroperitoneal Liposarcoma in a Woman With Neurofibromatosis Type 1" "tieneTextoCompleto" => true "saludo" => "To the Editor," "paginas" => array:1 [ 0 => array:2 [ "paginaInicial" => "856" "paginaFinal" => "858" ] ] "autores" => array:1 [ 0 => array:4 [ "autoresLista" => "L. Bou Boluda, J. Sabater Abad, E. Quecedo Estébanez, A.I. Jiménez Sánchez" "autores" => array:4 [ 0 => array:4 [ "nombre" => "L." "apellidos" => "Bou Boluda" "email" => array:1 [ 0 => "laiabou15@gmail.com" ] "referencia" => array:2 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">a</span>" "identificador" => "aff0005" ] 1 => array:2 [ "etiqueta" => "*" "identificador" => "cor0005" ] ] ] 1 => array:3 [ "nombre" => "J." "apellidos" => "Sabater Abad" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">a</span>" "identificador" => "aff0005" ] ] ] 2 => array:3 [ "nombre" => "E." "apellidos" => "Quecedo Estébanez" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">a</span>" "identificador" => "aff0005" ] ] ] 3 => array:3 [ "nombre" => "A.I." "apellidos" => "Jiménez Sánchez" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">b</span>" "identificador" => "aff0010" ] ] ] ] "afiliaciones" => array:2 [ 0 => array:3 [ "entidad" => "Servicio de Dermatología, Hospital Arnau de Vilanova, Valencia, Spain" "etiqueta" => "a" "identificador" => "aff0005" ] 1 => array:3 [ "entidad" => "Servicio de Anatomía Patológica, Hospital Arnau de Vilanova, Valencia, Spain" "etiqueta" => "b" "identificador" => "aff0010" ] ] "correspondencia" => array:1 [ 0 => array:3 [ "identificador" => "cor0005" "etiqueta" => "⁎" "correspondencia" => "Corresponding author." ] ] ] ] "titulosAlternativos" => array:1 [ "es" => array:1 [ "titulo" => "Liposarcoma retroperitoneal en una paciente con una neurofibromatosis tipo 1" ] ] "resumenGrafico" => array:2 [ "original" => 0 "multimedia" => array:8 [ "identificador" => "fig0010" "etiqueta" => "Figure 2" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr2.jpeg" "Alto" => 1240 "Ancho" => 1674 "Tamanyo" => 105648 ] ] "detalles" => array:1 [ 0 => array:3 [ "identificador" => "at0010" "detalle" => "Figure " "rol" => "short" ] ] "descripcion" => array:1 [ "en" => "<p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Radiologic image. Computed tomography scan of the abdomen showing a large right retroperitoneal mass with a diameter of 11 cm displacing adjacent structures.</p>" ] ] ] "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">Neurofibromatosis type 1 (NF1) is a common neurocutaneous syndrome that predisposes patients to the growth of several benign and malignant tumors, including malignant peripheral nerve sheath tumors (MPNSTs) and other soft tissue sarcomas.<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> Liposarcoma in association with NF1 is very rare and just 10 cases have been reported in the literature.<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a></p><p id="par0010" class="elsevierStylePara elsevierViewall">A 38-year-old woman with NF1 presented at the hospital’s emergency department with lower back pain of 3 months’ duration and constitutional symptoms. Physical examination of the abdomen revealed a large, hard mass on the right flank that was painful to the touch. She also had multiple café-au-lait spots, generalized freckles, mainly affecting the trunk and with a tendency to cluster in the area of the armpits, and several neurofibromas (<a class="elsevierStyleCrossRef" href="#fig0005">Fig. 1</a>). Computed tomography showed a right retroperitoneal mass with a diameter of 11 cm and multiple lung and brain lesions suggestive of metastasis (<a class="elsevierStyleCrossRef" href="#fig0010">Fig. 2</a>). Percutaneous biopsy of the mass showed a proliferation of spindle cells, extensive necrosis and abundant mitoses (<a class="elsevierStyleCrossRef" href="#fig0015">Fig. 3</a>A and B), and focal areas of increased cytoplasmic vacuolization consistent with adipocyte differentiation (<a class="elsevierStyleCrossRef" href="#fig0015">Fig. 3</a>C). Immunohistochemistry was positive for vimentin and CD99 only and negative for neural markers (S100, GFAP) and muscle markers (desmin and smooth muscle actin). Fluorescence in situ hybridization revealed <span class="elsevierStyleItalic">MDM2</span> amplification in the long arm of chromosome 12 (<a class="elsevierStyleCrossRef" href="#fig0015">Fig. 3</a>D), leading to a definitive diagnosis of high-grade dedifferentiated liposarcoma.</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><elsevierMultimedia ident="fig0010"></elsevierMultimedia><elsevierMultimedia ident="fig0015"></elsevierMultimedia><p id="par0015" class="elsevierStylePara elsevierViewall">Considering the extent of the disease, it was decided to treat the patient with palliative chemotherapy (adriamycin and olaratumab) and whole-brain radiotherapy. She was readmitted several months later because of clinical deterioration and poor pain control, and died shortly afterwards due to disease progression.</p><p id="par0020" class="elsevierStylePara elsevierViewall">NF1 is caused by an alteration in the neurofibromin gene on the long arm of chromosome 17. The protein exerts a negative regulatory effect on the RAS/MAPK pathway, and loss of function activates the pathway, favoring the formation of tumors, which are the most serious complication of NF1. MPNST is the most common tumor in this setting. It occurs in 8% to 12% of patients and generally arises in an existing plexiform neurofibroma. Patients with MPNST are also more likely to develop other malignancies, such as pilocytic astrocytomas, gastrointestinal stromal tumors, pheochromocytomas, rhabdomyosarcomas, and juvenile myelomonocytic leukemia.<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> Liposarcoma, however, is rare.<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a></p><p id="par0025" class="elsevierStylePara elsevierViewall">Liposarcomas are malignant tumors with adipocyte differentiation; they are among the most common soft tissue sarcomas. There are 4 histologic subtypes—well differentiated, dedifferentiated, myxoid, and pleomorphic—each with considerable epidemiologic, cytogenetic, molecular, and prognostic differences. Dedifferentiated liposarcomas account for just 15% of all liposarcomas and tend to occur in the retroperitoneal space.<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a></p><p id="par0030" class="elsevierStylePara elsevierViewall">Of the 10 cases of liposarcoma described in NF1 to date, 4 were pleomorphic, 2 were dedifferentiated, 2 were myxoid, and 1 was well differentiated. Histologic subtype was not specified in 1 case.<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a> This distribution of subtypes contrasts with that seen in the general population, where the most common subtype is well-differentiated liposarcoma (40%–50% of cases) and the least common, pleomorphic liposarcoma (< 10% of cases).<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a> The location of the tumors on the peritoneum or extremities, however, is similar to that observed in the general population.<a class="elsevierStyleCrossRefs" href="#bib0020"><span class="elsevierStyleSup">4,5</span></a> There have also been reports of liposarcomas involving the omentum,<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a> the temple,<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">7</span></a> and the small bowel mesentery.<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a> Considering the few cases of liposarcoma described in patients with NF1, it is difficult to determine whether they differ from other liposarcomas in terms of epidemiology or prognosis. They may, however, be associated with a worse prognosis as the more aggressive histologic subtypes appear to be more common in this setting.</p><p id="par0035" class="elsevierStylePara elsevierViewall">It should be noted that 4 of the liposarcomas described in association with NF1 in the literature arose in or adjacent to a pre-existing neurofibroma, giving rise to possible confusion with MPNST with liposarcomatous tissue. An estimated 15% of MPNSTs have heterologous elements, above all cartilage and bone, although they may also contain rhabdomyoblastic, squamous, glandular, and liposarcomatous tissue. Nonetheless, the pleomorphism observed in these 4 cases could be due to the multipotentiality of neurilemmal cells and their ability to undergo metaplasia to fat.<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">7</span></a> Loss of the <span class="elsevierStyleItalic">NF-1</span> tumor suppressor gene has been described in pleomorphic liposarcomas,<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a> and could explain the higher incidence of this more aggressive subtype in patients with NF1.</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Conflicts of Interest</span><p id="par0040" class="elsevierStylePara elsevierViewall">The authors declare that they have no conflicts of interest.</p></span></span>" "textoCompletoSecciones" => array:1 [ "secciones" => array:2 [ 0 => array:2 [ "identificador" => "sec0005" "titulo" => "Conflicts of Interest" ] 1 => array:1 [ "titulo" => "References" ] ] ] "pdfFichero" => "main.pdf" "tienePdf" => true "NotaPie" => array:1 [ 0 => array:2 [ "etiqueta" => "☆" "nota" => "<p class="elsevierStyleNotepara" id="npar0005">Please cite this article as: Bou Boluda L, Sabater Abad J, Quecedo Estébanez E, Jiménez Sánchez. Retroperitoneal Liposarcoma in a Woman With Neurofibromatosis Type 1. Actas Dermosifiliogr. 2021;112:856–858.</p>" ] ] "multimedia" => array:3 [ 0 => array:8 [ "identificador" => "fig0005" "etiqueta" => "Figure 1" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr1.jpeg" "Alto" => 1135 "Ancho" => 2924 "Tamanyo" => 241210 ] ] "detalles" => array:1 [ 0 => array:3 [ "identificador" => "at0005" "detalle" => "Figure " "rol" => "short" ] ] "descripcion" => array:1 [ "en" => "<p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Clinical presentation. A, Abdominal deformity caused by a mass on the right flank. B, Multiple freckles and several café au lait spots and neurofibromas on the trunk.</p>" ] ] 1 => array:8 [ "identificador" => "fig0010" "etiqueta" => "Figure 2" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr2.jpeg" "Alto" => 1240 "Ancho" => 1674 "Tamanyo" => 105648 ] ] "detalles" => array:1 [ 0 => array:3 [ "identificador" => "at0010" "detalle" => "Figure " "rol" => "short" ] ] "descripcion" => array:1 [ "en" => "<p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Radiologic image. Computed tomography scan of the abdomen showing a large right retroperitoneal mass with a diameter of 11 cm displacing adjacent structures.</p>" ] ] 2 => array:8 [ "identificador" => "fig0015" "etiqueta" => "Figure 3" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr3.jpeg" "Alto" => 1181 "Ancho" => 1674 "Tamanyo" => 347946 ] ] "detalles" => array:1 [ 0 => array:3 [ "identificador" => "at0015" "detalle" => "Figure " "rol" => "short" ] ] "descripcion" => array:1 [ "en" => "<p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">Histology and fluorescence in situ hybridization (FISH). A, B, Staining with hematoxylin-eosin showing a proliferation of neoplastic spindle-shaped cells. C, Focal areas with adipocyte differentiation. D, FISH showing <span class="elsevierStyleItalic">MDM2</span> amplification on the right arm of chromosome 12.</p>" ] ] ] "bibliografia" => array:2 [ "titulo" => "References" "seccion" => array:1 [ 0 => array:2 [ "identificador" => "bibs0005" "bibliografiaReferencia" => array:7 [ 0 => array:3 [ "identificador" => "bib0005" "etiqueta" => "1" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Neurofibromatosis tipo 1: más que manchas café con leche, efélides y neurofibromas. Parte II. Actualización sobre otras manifestaciones cutáneas características de la enfermedad. NF1 y cáncer" "autores" => array:1 [ 0 => array:2 [ "etal" => false "autores" => array:2 [ 0 => "A. Hernández-Martín" 1 => "A. 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Year/Month | Html | Total | |
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2024 November | 7 | 14 | 21 |
2024 October | 78 | 64 | 142 |
2024 September | 105 | 30 | 135 |
2024 August | 106 | 69 | 175 |
2024 July | 84 | 32 | 116 |
2024 June | 75 | 36 | 111 |
2024 May | 70 | 34 | 104 |
2024 April | 78 | 32 | 110 |
2024 March | 75 | 28 | 103 |
2024 February | 51 | 32 | 83 |
2024 January | 63 | 36 | 99 |
2023 December | 71 | 16 | 87 |
2023 November | 71 | 29 | 100 |
2023 October | 70 | 26 | 96 |
2023 September | 78 | 33 | 111 |
2023 August | 39 | 18 | 57 |
2023 July | 75 | 47 | 122 |
2023 June | 57 | 33 | 90 |
2023 May | 77 | 32 | 109 |
2023 April | 48 | 27 | 75 |
2023 March | 59 | 35 | 94 |
2023 February | 57 | 25 | 82 |
2023 January | 51 | 43 | 94 |
2022 December | 83 | 65 | 148 |
2022 November | 43 | 39 | 82 |
2022 October | 37 | 21 | 58 |
2022 September | 38 | 53 | 91 |
2022 August | 33 | 39 | 72 |
2022 July | 15 | 37 | 52 |
2022 June | 20 | 29 | 49 |
2022 May | 49 | 51 | 100 |
2022 April | 65 | 33 | 98 |
2022 March | 57 | 54 | 111 |
2022 February | 75 | 32 | 107 |
2022 January | 72 | 34 | 106 |
2021 December | 70 | 44 | 114 |
2021 November | 68 | 50 | 118 |
2021 October | 83 | 79 | 162 |
2021 September | 59 | 54 | 113 |
2021 August | 79 | 70 | 149 |
2021 July | 0 | 3 | 3 |