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se realiz&#243; una ampliaci&#243;n quir&#250;rgica de los m&#225;rgenes de 0&#44;5<span class="elsevierStyleHsp" style=""></span>mm&#44; resultando sin hallazgos patol&#243;gicos a la histolog&#237;a&#46; Tras 10 meses de seguimiento&#44; no se han observado signos de recurrencia&#46;</p></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0030">Comentario</span><p id="par0035" class="elsevierStylePara elsevierViewall">El fibromixoma acral superficial es un tumor mesenquimatoso benigno que afecta principalmente a hombres en la quinta d&#233;cada de la vida&#46; La mayor&#237;a de los casos publicados lo ubican en las &#225;reas peri y subungueal<a class="elsevierStyleCrossRefs" href="#bib0035"><span class="elsevierStyleSup">1&#8211;3</span></a>&#46;</p><p id="par0040" class="elsevierStylePara elsevierViewall">Cl&#237;nicamente suele ser un tumor no encapsulado&#44; bien circunscrito&#44; polipoide o verrugoso&#44; en forma de c&#250;pula&#44; que se extiende por toda la dermis con una extensi&#243;n posible al tejido subcut&#225;neo&#44; la fascia subyacente o la capa peri&#243;stica<a class="elsevierStyleCrossRefs" href="#bib0040"><span class="elsevierStyleSup">2&#8211;4</span></a>&#46;</p><p id="par0045" class="elsevierStylePara elsevierViewall">El examen radiol&#243;gico es inespec&#237;fico&#44; pero en un tercio de los casos pueden coexistir erosiones &#243;seas o lesiones l&#237;ticas<a class="elsevierStyleCrossRefs" href="#bib0035"><span class="elsevierStyleSup">1&#8211;5</span></a>&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">En la histolog&#237;a&#44; la epidermis puede presentar hiperqueratosis&#46; A nivel d&#233;rmico&#44; destaca una proliferaci&#243;n de fibroblastos fusiformes dentro de una matriz mixoide&#44; con atipia nuclear e infiltraci&#243;n de mastocitos&#46; La inmunohistoqu&#237;mica muestra una positividad para CD34&#44; CD99&#44; vimentina y EMA&#44; y una negatividad para los marcadores de diferenciaci&#243;n neural y muscular &#40;S100&#44; 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CASOS PARA EL DIAGNÓSTICO
Pápula pedunculada en región plantar
Pedunculated Papule on the Sole of the Foot
I. Arreguia,
Corresponding author
isidora.arregui@gmail.com

Autor para correspondencia.
, C. Ñancob, F. Mardonesc
a Médico cirujano, Universidad de los Andes, Santiago, Chile
b Residente Dermatología 2o año, Universidad de los Andes, Santiago, Chile
c Dermatólogo, Clínica Universidad de los Andes, Santiago, Chile
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1</a>&#41;&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Histopatolog&#237;a</span><p id="par0015" class="elsevierStylePara elsevierViewall">Se extirp&#243; mediante biopsia excisional y el estudio histopatol&#243;gico inform&#243; a nivel d&#233;rmico una proliferaci&#243;n de c&#233;lulas fusiformes homog&#233;neas inmersas en un estroma mixoide &#40;<a class="elsevierStyleCrossRef" href="#fig0010">fig&#46; 2</a>&#44; tinci&#243;n hematoxilina-eosina&#44; &#215;200&#41;&#46; El estudio con inmunohistoqu&#237;mica fue positivo para CD34 y negativo para S100 &#40;<a class="elsevierStyleCrossRef" href="#fig0015">fig&#46; 3</a>&#44; t&#233;cnica inmunohistoqu&#237;mica CD34&#44; &#215;200&#41;&#46;</p><elsevierMultimedia ident="fig0010"></elsevierMultimedia><elsevierMultimedia ident="fig0015"></elsevierMultimedia><p id="par0020" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleBold">&#191;Cu&#225;l es su diagn&#243;stico&#63;</span></p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0020">Diagn&#243;stico</span><p id="par0025" class="elsevierStylePara elsevierViewall">Fibromixoma acral superficial&#46;</p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Evoluci&#243;n y tratamiento</span><p id="par0030" class="elsevierStylePara elsevierViewall">Posteriormente al diagn&#243;stico&#44; se realiz&#243; una ampliaci&#243;n quir&#250;rgica de los m&#225;rgenes de 0&#44;5<span class="elsevierStyleHsp" style=""></span>mm&#44; resultando sin hallazgos patol&#243;gicos a la histolog&#237;a&#46; Tras 10 meses de seguimiento&#44; no se han observado signos de recurrencia&#46;</p></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0030">Comentario</span><p id="par0035" class="elsevierStylePara elsevierViewall">El fibromixoma acral superficial es un tumor mesenquimatoso benigno que afecta principalmente a hombres en la quinta d&#233;cada de la vida&#46; La mayor&#237;a de los casos publicados lo ubican en las &#225;reas peri y subungueal<a class="elsevierStyleCrossRefs" href="#bib0035"><span class="elsevierStyleSup">1&#8211;3</span></a>&#46;</p><p id="par0040" class="elsevierStylePara elsevierViewall">Cl&#237;nicamente suele ser un tumor no encapsulado&#44; bien circunscrito&#44; polipoide o verrugoso&#44; en forma de c&#250;pula&#44; que se extiende por toda la dermis con una extensi&#243;n posible al tejido subcut&#225;neo&#44; la fascia subyacente o la capa peri&#243;stica<a class="elsevierStyleCrossRefs" href="#bib0040"><span class="elsevierStyleSup">2&#8211;4</span></a>&#46;</p><p id="par0045" class="elsevierStylePara elsevierViewall">El examen radiol&#243;gico es inespec&#237;fico&#44; pero en un tercio de los casos pueden coexistir erosiones &#243;seas o lesiones l&#237;ticas<a class="elsevierStyleCrossRefs" href="#bib0035"><span class="elsevierStyleSup">1&#8211;5</span></a>&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">En la histolog&#237;a&#44; la epidermis puede presentar hiperqueratosis&#46; A nivel d&#233;rmico&#44; destaca una proliferaci&#243;n de fibroblastos fusiformes dentro de una matriz mixoide&#44; con atipia nuclear e infiltraci&#243;n de mastocitos&#46; La inmunohistoqu&#237;mica muestra una positividad para CD34&#44; CD99&#44; vimentina y EMA&#44; y una negatividad para los marcadores de diferenciaci&#243;n neural y muscular &#40;S100&#44; HMB-45&#44; SMA&#44; desmina y actina&#41;<a class="elsevierStyleCrossRefs" href="#bib0035"><span class="elsevierStyleSup">1&#44;3&#44;5</span></a>&#46;</p><p id="par0055" class="elsevierStylePara elsevierViewall">Los diagn&#243;sticos diferenciales incluyen fibroqueratoma&#44; fibroma y verruga plantar<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">3</span></a>&#46; Asimismo&#44; se deben considerar los tumores negativos para CD34 &#40;tumor gl&#243;mico&#44; perineuroma esclerosante&#44; fibroqueratoma digital adquirido y fibroma periungueal&#41;&#44; y tambi&#233;n los tumores positivos para CD34 &#40;angiomixoma superficial&#44; dermatofibrosarcoma protuberans y neurofibroma mixoide&#41;<a class="elsevierStyleCrossRefs" href="#bib0035"><span class="elsevierStyleSup">1&#44;3&#44;5</span></a>&#46;</p><p id="par0060" class="elsevierStylePara elsevierViewall">El tratamiento &#243;ptimo es la resecci&#243;n con m&#225;rgenes libres&#44; dado que existe recurrencia local en aproximadamente el 20-25&#37; de los casos&#46; Si bien su curso natural parece benigno&#44; el espectro histopatol&#243;gico de los fibroblastos fusiformes es variable&#44; existiendo desde una atipia nuclear leve hasta una atipia importante&#44; siendo su transformaci&#243;n hacia una neoplasia maligna de bajo grado te&#243;ricamente posible<a class="elsevierStyleCrossRefs" href="#bib0050"><span class="elsevierStyleSup">4&#44;6</span></a>&#46; Sin embargo&#44; su pron&#243;stico es excelente y hasta la fecha no se ha descrito en la literatura su transformaci&#243;n maligna o el desarrollo de met&#225;stasis<a class="elsevierStyleCrossRefs" href="#bib0035"><span class="elsevierStyleSup">1&#44;3&#8211;5</span></a>&#46;</p></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Conflicto de intereses</span><p id="par0065" class="elsevierStylePara elsevierViewall">Los autores declaramos no tener ning&#250;n tipo de relaci&#243;n financiera o personal con otras personas u organizaciones que pudieran dar lugar a un conflicto de intereses en relaci&#243;n con el art&#237;culo que se presenta para publicaci&#243;n&#46;</p></span></span>"
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Original language: Spanish
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