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A associa&#231;&#227;o de mixoma prim&#225;rio pulmonar com outras neoplasias s&#237;ncronas&#44; nomeadamente com o adenocarcinoma pulmonar&#44; est&#225; descrita<a class="elsevierStyleCrossRef" href="#bib0085"><span class="elsevierStyleSup">5</span></a>&#46; Os autores apresentam um caso de mixoma pulmonar prim&#225;rio endobr&#244;nquico&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Caso cl&#237;nico</span><p id="par0010" class="elsevierStylePara elsevierViewall">Mulher de 42 anos&#44; ex-fumadora desde junho 2007 &#40;5 UMA&#41;&#44; trabalhadora em ind&#250;stria t&#234;xtil desde os 13 anos&#46; Antecedentes de asma br&#244;nquica desde a inf&#226;ncia&#44; habitualmente medicada com broncodilatadores inalados&#44; seguida em Consulta Externa de Pneumologia&#46; Hist&#243;ria de pneumonia lobar m&#233;dia em Junho de 2006&#44; tratada em ambulat&#243;rio&#44; com boa evolu&#231;&#227;o e sem aparentes sequelas&#46; Desde h&#225; 3 anos com infe&#231;&#245;es respirat&#243;rias de repeti&#231;&#227;o associadas a agravamento de dispneia&#46; Salienta-se ainda hist&#243;ria familiar significativa de asma &#40;av&#243;s paternos&#44; pai e irm&#227;o&#41;&#46;</p><p id="par0015" class="elsevierStylePara elsevierViewall">Em Junho de 2007 inicia queixas de tosse com expetora&#231;&#227;o mucosa escassa e pieira&#46; Ao exame objetivo&#44; de salientar sibil&#226;ncia &#224; ausculta&#231;&#227;o pulmonar na metade inferior do hemit&#243;rax direito&#44; sem sinais de dificuldade respirat&#243;ria ou outras altera&#231;&#245;es de relevo&#46; Realizou radiografia tor&#225;cica que mostrou hipotranspar&#234;ncia de forma triangular no ter&#231;o inferior do campo pulmonar direito &#40;<a class="elsevierStyleCrossRef" href="#fig0010">fig&#46; 1</a>&#41;&#46; Complementou estudo imagiol&#243;gico com TC tor&#225;cica que revelou atelectasia do lobo m&#233;dio e imagem nodular no br&#244;nquio lobar m&#233;dio com cerca de 6<span class="elsevierStyleHsp" style=""></span>mm &#40;<a class="elsevierStyleCrossRef" href="#fig0015">fig&#46; 2</a>&#41;&#46; Analiticamente apresentava hemograma&#44; ionograma&#44; fun&#231;&#227;o hep&#225;tica e renal sem altera&#231;&#245;es&#46; As provas funcionais respirat&#243;rias revelaram s&#237;ndrome obstrutiva ligeira&#46; Realizou broncofibroscopia que mostrou forma&#231;&#227;o tumoral na entrada do br&#244;nquio lobar m&#233;dio&#44; muito vascularizada&#44; causando obstru&#231;&#227;o total deste &#40;<a class="elsevierStyleCrossRef" href="#fig0020">fig&#46; 3</a>&#41;&#46; N&#227;o foi realizada biopsia da les&#227;o pelo aspeto morfol&#243;gico sugestivo de tumor carcinoide e pelo risco de hemorragia associado&#46; A doente foi ent&#227;o submetida a broncoscopia r&#237;gida&#44; sendo efetuada biopsia da les&#227;o&#44; cujo estudo an&#225;tomo-patol&#243;gico foi inconclusivo&#46;</p><elsevierMultimedia ident="fig0010"></elsevierMultimedia><elsevierMultimedia ident="fig0015"></elsevierMultimedia><elsevierMultimedia ident="fig0020"></elsevierMultimedia><p id="par0020" class="elsevierStylePara elsevierViewall">A doente foi orientada para consulta de Cirurgia Tor&#225;cica para avalia&#231;&#227;o pr&#233;-cir&#250;rgica da les&#227;o&#44; que incluiu a execu&#231;&#227;o de tomografia de emiss&#227;o de positr&#245;es &#40;PET&#41;&#44; que n&#227;o revelou qualquer foco de capta&#231;&#227;o significativamente anormal do radiof&#225;rmaco&#46; A doente foi submetida a lobectomia do lobo m&#233;dio em setembro de 2007&#44; sem intercorr&#234;ncias&#46;</p><p id="par0025" class="elsevierStylePara elsevierViewall">No exame an&#225;tomo-patol&#243;gico observou-se&#44; &#224; macroscopia&#44; o lobo m&#233;dio com 37&#44;2<span class="elsevierStyleHsp" style=""></span>g e 9<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>7<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>2&#44;5<span class="elsevierStyleHsp" style=""></span>cm&#44; com segmento br&#244;nquico de 0&#44;5<span class="elsevierStyleHsp" style=""></span>cm&#44; e exterioriza&#231;&#227;o de n&#243;dulo de 5<span class="elsevierStyleHsp" style=""></span>mm de aspeto mixoide e de cor acinzentada&#46; Microscopicamente&#44; tratava-se de neoplasia benigna subepitelial&#44; com estroma mixoide de padr&#227;o lobulado e c&#233;lulas estromais fusiformes curtas ou estreladas&#44; sem atipias&#46; O estroma foi positivo para Azul de Alcian e as c&#233;lulas estromais positivas para PAS e Vimentina&#46; N&#227;o se documentou a presen&#231;a de cartilagem mesmo em cortes seriados&#44; mais profundos&#44; nem com recurso a estudo imuno-histoqu&#237;mico&#46; Este conjunto de caracter&#237;sticas morfol&#243;gicas &#233; compat&#237;vel com mixoma pulmonar prim&#225;rio &#40;<a class="elsevierStyleCrossRefs" href="#fig0025">figs&#46; 4 a 7</a>&#41;&#46;</p><elsevierMultimedia ident="fig0025"></elsevierMultimedia><elsevierMultimedia ident="fig0030"></elsevierMultimedia><elsevierMultimedia ident="fig0035"></elsevierMultimedia><elsevierMultimedia ident="fig0040"></elsevierMultimedia><p id="par0030" class="elsevierStylePara elsevierViewall">Em TC tor&#225;cica de reavalia&#231;&#227;o confirmou-se a aus&#234;ncia do lobo m&#233;dio por ex&#233;rese cir&#250;rgica&#44; sem outras altera&#231;&#245;es de relevo&#46; Atualmente&#44; a doente encontra-se assintom&#225;tica&#44; ap&#243;s 3 anos de vigil&#226;ncia na consulta externa de Pneumologia&#46;</p></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Discuss&#227;o</span><p id="par0035" class="elsevierStylePara elsevierViewall">Os mixomas s&#227;o tumores mesenquimatosos benignos que podem ocorrer em muitas localiza&#231;&#245;es&#46; O tipo mais comum &#233; o mixoma prim&#225;rio card&#237;aco e ocorre maioritariamente no adulto&#44; correspondendo a 30-50&#37; dos tumores card&#237;acos&#46; Apesar de a maioria ser espor&#225;dica&#44; cerca de 7&#37; dos casos s&#227;o familiares com transmiss&#227;o autoss&#243;mica dominante<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a>&#46; A associa&#231;&#227;o entre mixoma auricular e mixomas extracard&#237;acos &#40;com envolvimento de v&#225;rios locais&#41; ou s&#237;ndrome de <span class="elsevierStyleItalic">Cushing</span> est&#225; descrita como s&#237;ndrome de <span class="elsevierStyleItalic">Carney</span><a class="elsevierStyleCrossRefs" href="#bib0030"><span class="elsevierStyleSup">6&#44;7</span></a> Cerca de 71&#37; dos mixomas ocorrem no cora&#231;&#227;o&#44; 41&#37; na pele e 7&#37; na cavidade oral &#40;geralmente no palato&#41;<a class="elsevierStyleCrossRef" href="#bib0040"><span class="elsevierStyleSup">8</span></a>&#46; Mixomas espor&#225;dicos extracard&#237;acos s&#227;o extremamente raros&#44; com poucos casos descritos na literatura m&#233;dica&#46; A apresenta&#231;&#227;o cl&#237;nica&#44; o tratamento e a evolu&#231;&#227;o est&#227;o bem documentados em rela&#231;&#227;o ao mixoma card&#237;aco<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a>&#46;</p><p id="par0040" class="elsevierStylePara elsevierViewall">A incid&#234;ncia de tumores s&#237;ncronos pulmonares benignos e malignos est&#225; descrita&#44; mas &#233; muito baixa&#44; n&#227;o se conhecendo associa&#231;&#227;o entre estas entidades&#46; Os mixomas geralmente n&#227;o metastizam&#44; contudo&#44; est&#227;o descritas met&#225;stases para o c&#233;rebro&#44; osso e tecidos moles e a recidiva local do tumor<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">9&#8211;12</span></a>&#44; sendo atribu&#237;das &#224; possibilidade de emboliza&#231;&#227;o ou origem sarcomatosa da neoplasia<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">13</span></a>&#44; estando aconselhada uma longa vigil&#226;ncia nestes casos<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">14</span></a>&#46;</p><p id="par0045" class="elsevierStylePara elsevierViewall">Na nossa doente o mixoma foi detetado na sequ&#234;ncia do estudo de infe&#231;&#245;es respirat&#243;rias de repeti&#231;&#227;o e agravamento de dispneia em doente com antecedentes de asma&#46; A presen&#231;a de tumor endobr&#244;nquico esteve na base do mau controlo da doen&#231;a asm&#225;tica e das infe&#231;&#245;es respirat&#243;rias de repeti&#231;&#227;o&#46; Perante a suspeita de malignidade&#44; optou-se pela ex&#233;rese cir&#250;rgica da les&#227;o&#46; O exame microsc&#243;pico do tumor revelou c&#233;lulas estreladas dispersas num estroma mixoide&#44; com vasos de paredes finas&#44; caracter&#237;sticas t&#237;picas do mixoma&#46; N&#227;o foi observada atividade mit&#243;tica&#44; arquitetura microc&#237;stica ou pleomorfismo nuclear&#44; assim como uma diferencia&#231;&#227;o cartilag&#237;nea ou epitelial evidente esteve ausente em estudo imuno-histoqu&#237;mico&#46; Estas caracter&#237;sticas morfol&#243;gicas e imuno-histoqu&#237;micas&#44; nomeadamente a presen&#231;a de estroma mixoide e a aus&#234;ncia de diferencia&#231;&#227;o condromatosa ou epitelial&#44; permitem o diagn&#243;stico diferencial com o tumor benigno mesenquimatoso pulmonar mais frequente&#44; o hamartoma&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">A sua evolu&#231;&#227;o cl&#237;nica benigna &#233; semelhante a outros casos de mixoma pulmonar prim&#225;rio<a class="elsevierStyleCrossRefs" href="#bib0010"><span class="elsevierStyleSup">2&#8211;4&#44;15&#44;16</span></a>&#44; sem recorr&#234;ncia da doen&#231;a ap&#243;s longo <span class="elsevierStyleItalic">follow-up&#46;</span> A apresenta&#231;&#227;o cl&#237;nica est&#225; relacionada com a localiza&#231;&#227;o do tumor&#46; Les&#227;o endobr&#244;nquica pode causar tosse&#44; sibil&#226;ncia e infe&#231;&#227;o recorrente&#44; enquanto um n&#243;dulo solit&#225;rio do pulm&#227;o diagnosticado acidentalmente pode ser forma de apresenta&#231;&#227;o de localiza&#231;&#245;es mais perif&#233;ricas<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">16</span></a>&#46; A presen&#231;a de estroma mixoide&#44; vasos de paredes finas&#44; c&#233;lulas estreladas e alongadas&#44; combinada com a aus&#234;ncia de diferencia&#231;&#227;o cartilag&#237;nea&#44; epitelial&#44; lipomatosa ou neural&#44; s&#227;o as caracter&#237;sticas chave no diagn&#243;stico do mixoma&#44; e est&#227;o presentes nos outros casos publicados<a class="elsevierStyleCrossRefs" href="#bib0010"><span class="elsevierStyleSup">2&#8211;4&#44;15&#44;16</span></a>&#46;</p><p id="par0055" class="elsevierStylePara elsevierViewall">Na literatura m&#233;dica s&#227;o escassos os dados no que diz respeito ao tratamento&#44; evolu&#231;&#227;o e progn&#243;stico dos mixomas pulmonares prim&#225;rios&#44; pelo que resolvemos apresentar este caso&#46;</p></span></span>"
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        "titulo" => "Resumo"
        "resumen" => "<span><span class="elsevierStyleSectionTitle">Introdu&#231;&#227;o</span><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Os mixomas pulmonares s&#227;o tumores benignos muito raros e quase sempre de localiza&#231;&#227;o par&#234;nquimatosa&#44; mas ocasionalmente podem ocorrer na &#225;rvore traqueo-br&#244;nquica&#46; Est&#227;o descritos raros casos de mixomas pulmonares endobr&#244;nquicos na literatura m&#233;dica&#46;</p></span> <span><span class="elsevierStyleSectionTitle">Caso cl&#237;nico</span><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Doente do sexo feminino&#44; de 40 anos&#44; com hist&#243;ria de asma e pneumonias de repeti&#231;&#227;o &#224; direita&#46; A tomografia computadorizada &#40;TC&#41; do t&#243;rax revelou atelectasia do lobo m&#233;dio&#46; A broncofibroscopia revelou les&#227;o tumoral polip&#243;ide&#44; de limites bem definidos&#44; causando obstru&#231;&#227;o total do br&#244;nquio lobar m&#233;dio&#46; A biopsia do tumor n&#227;o foi diagn&#243;stica&#46; A tomografia por emiss&#227;o de positr&#245;es &#40;PET&#41; demonstrou atividade metab&#243;lica baixa do tumor e aus&#234;ncia de evid&#234;ncia de malignidade noutros locais&#46; A doente foi submetida a lobectomia m&#233;dia e o exame microsc&#243;pico do tumor revelou um padr&#227;o lobular com c&#233;lulas alongadas e estreladas&#44; tipo fibroblasto&#44; com estroma mixoide intercelular abundante&#44; compat&#237;vel com mixoma pulmonar&#46;</p></span> <span><span class="elsevierStyleSectionTitle">Conclus&#227;o</span><p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">O mixoma pulmonar &#233; muito raro e a sua localiza&#231;&#227;o endobr&#244;nquica est&#225; descrita em poucos casos na literatura m&#233;dica&#46;</p></span>"
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        "resumen" => "<span><span class="elsevierStyleSectionTitle">Introduction</span><p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">Pulmonary myxoma is an extremely rare benign neoplasm&#46; It is mostly parenchymal but may occasionally occur within the tracheobronchial tree&#46; There are very few reports of endobronchial myxoma&#46;</p></span> <span><span class="elsevierStyleSectionTitle">Case report</span><p id="spar0025" class="elsevierStyleSimplePara elsevierViewall">We describe a case of endobronchial myxoma in a 40-year-old female patient with a history of asthma and repeated right-sided pneumonia&#46; Thoracic computed tomography &#40;CT&#41; showed medium lobe atelectasis&#46; Fiber optic bronchoscopy revealed a polypoid&#44; well-circumscribed tumor&#44; causing total obstruction of the medium lobe bronchus&#46; Biopsy of the mass was non-diagnostic&#46; Further study included a positron emission tomography &#40;PET&#41; which demonstrated low metabolic activity of the tumor and no evidence of neoplasia in other location&#46; The patient was submitted to a medium lobectomy and microscopic examination of the tumor revealed myxoid stroma with lobulated pattern&#44; elongated and stellate cells&#44; compatible with myxoma&#46;</p></span> <span><span class="elsevierStyleSectionTitle">Conclusion</span><p id="spar0030" class="elsevierStyleSimplePara elsevierViewall">Pulmonary myxoma is extraordinary rare and endobronchial location is very few reported in medical literature&#46;</p></span>"
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                      "titulo" => "Right Atrial Myxoma With Extracardiac Manifestations"
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                            0 => "E&#46;H&#46; McCoskey"
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                      "titulo" => "Primary Pulmonary Myxoma"
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Caso clínico
Mixoma endobrônquico – Caso clínico
Endobronchial myxoma – Case report
R. Roloa,
Corresponding author
rui.rolo@sapo.pt

Autor para correspondência.
, R. Pereirab, R. Eiselec, L. Ferreiraa, R. Nogueirac, J. Cunhaa
a Serviço de Pneumologia, Hospital de Braga, Braga, Portugal
b Serviço de Cirurgia Cardio-Torácica, Centro Hospitalar de Vila Nova de Gaia, Espinho, Portugal
c Serviço de Anatomia Patológica, Centro Hospitalar de Vila Nova de Gaia, Espinho, Portugal
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2</a>&#41;&#46; Analiticamente apresentava hemograma&#44; ionograma&#44; fun&#231;&#227;o hep&#225;tica e renal sem altera&#231;&#245;es&#46; As provas funcionais respirat&#243;rias revelaram s&#237;ndrome obstrutiva ligeira&#46; Realizou broncofibroscopia que mostrou forma&#231;&#227;o tumoral na entrada do br&#244;nquio lobar m&#233;dio&#44; muito vascularizada&#44; causando obstru&#231;&#227;o total deste &#40;<a class="elsevierStyleCrossRef" href="#fig0020">fig&#46; 3</a>&#41;&#46; N&#227;o foi realizada biopsia da les&#227;o pelo aspeto morfol&#243;gico sugestivo de tumor carcinoide e pelo risco de hemorragia associado&#46; A doente foi ent&#227;o submetida a broncoscopia r&#237;gida&#44; sendo efetuada biopsia da les&#227;o&#44; cujo estudo an&#225;tomo-patol&#243;gico foi inconclusivo&#46;</p><elsevierMultimedia ident="fig0010"></elsevierMultimedia><elsevierMultimedia ident="fig0015"></elsevierMultimedia><elsevierMultimedia ident="fig0020"></elsevierMultimedia><p id="par0020" class="elsevierStylePara elsevierViewall">A doente foi orientada para consulta de Cirurgia Tor&#225;cica para avalia&#231;&#227;o pr&#233;-cir&#250;rgica da les&#227;o&#44; 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Microscopicamente&#44; tratava-se de neoplasia benigna subepitelial&#44; com estroma mixoide de padr&#227;o lobulado e c&#233;lulas estromais fusiformes curtas ou estreladas&#44; sem atipias&#46; O estroma foi positivo para Azul de Alcian e as c&#233;lulas estromais positivas para PAS e Vimentina&#46; N&#227;o se documentou a presen&#231;a de cartilagem mesmo em cortes seriados&#44; mais profundos&#44; nem com recurso a estudo imuno-histoqu&#237;mico&#46; Este conjunto de caracter&#237;sticas morfol&#243;gicas &#233; compat&#237;vel com mixoma pulmonar prim&#225;rio &#40;<a class="elsevierStyleCrossRefs" href="#fig0025">figs&#46; 4 a 7</a>&#41;&#46;</p><elsevierMultimedia ident="fig0025"></elsevierMultimedia><elsevierMultimedia ident="fig0030"></elsevierMultimedia><elsevierMultimedia ident="fig0035"></elsevierMultimedia><elsevierMultimedia ident="fig0040"></elsevierMultimedia><p id="par0030" class="elsevierStylePara elsevierViewall">Em TC tor&#225;cica de reavalia&#231;&#227;o confirmou-se a aus&#234;ncia do lobo m&#233;dio por ex&#233;rese cir&#250;rgica&#44; sem outras altera&#231;&#245;es de relevo&#46; Atualmente&#44; a doente encontra-se assintom&#225;tica&#44; ap&#243;s 3 anos de vigil&#226;ncia na consulta externa de Pneumologia&#46;</p></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Discuss&#227;o</span><p id="par0035" class="elsevierStylePara elsevierViewall">Os mixomas s&#227;o tumores mesenquimatosos benignos que podem ocorrer em muitas localiza&#231;&#245;es&#46; O tipo mais comum &#233; o mixoma prim&#225;rio card&#237;aco e ocorre maioritariamente no adulto&#44; correspondendo a 30-50&#37; dos tumores card&#237;acos&#46; Apesar de a maioria ser espor&#225;dica&#44; cerca de 7&#37; dos casos s&#227;o familiares com transmiss&#227;o autoss&#243;mica dominante<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a>&#46; A associa&#231;&#227;o entre mixoma auricular e mixomas extracard&#237;acos &#40;com envolvimento de v&#225;rios locais&#41; ou s&#237;ndrome de <span class="elsevierStyleItalic">Cushing</span> est&#225; descrita como s&#237;ndrome de <span class="elsevierStyleItalic">Carney</span><a class="elsevierStyleCrossRefs" href="#bib0030"><span class="elsevierStyleSup">6&#44;7</span></a> Cerca de 71&#37; dos mixomas ocorrem no cora&#231;&#227;o&#44; 41&#37; na pele e 7&#37; na cavidade oral &#40;geralmente no palato&#41;<a class="elsevierStyleCrossRef" href="#bib0040"><span class="elsevierStyleSup">8</span></a>&#46; Mixomas espor&#225;dicos extracard&#237;acos s&#227;o extremamente raros&#44; com poucos casos descritos na literatura m&#233;dica&#46; A apresenta&#231;&#227;o cl&#237;nica&#44; o tratamento e a evolu&#231;&#227;o est&#227;o bem documentados em rela&#231;&#227;o ao mixoma card&#237;aco<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a>&#46;</p><p id="par0040" class="elsevierStylePara elsevierViewall">A incid&#234;ncia de tumores s&#237;ncronos pulmonares benignos e malignos est&#225; descrita&#44; mas &#233; muito baixa&#44; n&#227;o se conhecendo associa&#231;&#227;o entre estas entidades&#46; Os mixomas geralmente n&#227;o metastizam&#44; contudo&#44; est&#227;o descritas met&#225;stases para o c&#233;rebro&#44; osso e tecidos moles e a recidiva local do tumor<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">9&#8211;12</span></a>&#44; sendo atribu&#237;das &#224; possibilidade de emboliza&#231;&#227;o ou origem sarcomatosa da neoplasia<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">13</span></a>&#44; estando aconselhada uma longa vigil&#226;ncia nestes casos<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">14</span></a>&#46;</p><p id="par0045" class="elsevierStylePara elsevierViewall">Na nossa doente o mixoma foi detetado na sequ&#234;ncia do estudo de infe&#231;&#245;es respirat&#243;rias de repeti&#231;&#227;o e agravamento de dispneia em doente com antecedentes de asma&#46; A presen&#231;a de tumor endobr&#244;nquico esteve na base do mau controlo da doen&#231;a asm&#225;tica e das infe&#231;&#245;es respirat&#243;rias de repeti&#231;&#227;o&#46; Perante a suspeita de malignidade&#44; optou-se pela ex&#233;rese cir&#250;rgica da les&#227;o&#46; O exame microsc&#243;pico do tumor revelou c&#233;lulas estreladas dispersas num estroma mixoide&#44; com vasos de paredes finas&#44; caracter&#237;sticas t&#237;picas do mixoma&#46; N&#227;o foi observada atividade mit&#243;tica&#44; arquitetura microc&#237;stica ou pleomorfismo nuclear&#44; assim como uma diferencia&#231;&#227;o cartilag&#237;nea ou epitelial evidente esteve ausente em estudo imuno-histoqu&#237;mico&#46; Estas caracter&#237;sticas morfol&#243;gicas e imuno-histoqu&#237;micas&#44; nomeadamente a presen&#231;a de estroma mixoide e a aus&#234;ncia de diferencia&#231;&#227;o condromatosa ou epitelial&#44; permitem o diagn&#243;stico diferencial com o tumor benigno mesenquimatoso pulmonar mais frequente&#44; o hamartoma&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">A sua evolu&#231;&#227;o cl&#237;nica benigna &#233; semelhante a outros casos de mixoma pulmonar prim&#225;rio<a class="elsevierStyleCrossRefs" href="#bib0010"><span class="elsevierStyleSup">2&#8211;4&#44;15&#44;16</span></a>&#44; sem recorr&#234;ncia da doen&#231;a ap&#243;s longo <span class="elsevierStyleItalic">follow-up&#46;</span> A apresenta&#231;&#227;o cl&#237;nica est&#225; relacionada com a localiza&#231;&#227;o do tumor&#46; Les&#227;o endobr&#244;nquica pode causar tosse&#44; sibil&#226;ncia e infe&#231;&#227;o recorrente&#44; enquanto um n&#243;dulo solit&#225;rio do pulm&#227;o diagnosticado acidentalmente pode ser forma de apresenta&#231;&#227;o de localiza&#231;&#245;es mais perif&#233;ricas<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">16</span></a>&#46; A presen&#231;a de estroma mixoide&#44; vasos de paredes finas&#44; c&#233;lulas estreladas e alongadas&#44; combinada com a aus&#234;ncia de diferencia&#231;&#227;o cartilag&#237;nea&#44; epitelial&#44; lipomatosa ou neural&#44; s&#227;o as caracter&#237;sticas chave no diagn&#243;stico do mixoma&#44; e est&#227;o presentes nos outros casos publicados<a class="elsevierStyleCrossRefs" href="#bib0010"><span class="elsevierStyleSup">2&#8211;4&#44;15&#44;16</span></a>&#46;</p><p id="par0055" class="elsevierStylePara elsevierViewall">Na literatura m&#233;dica s&#227;o escassos os dados no que diz respeito ao tratamento&#44; evolu&#231;&#227;o e progn&#243;stico dos mixomas pulmonares prim&#225;rios&#44; pelo que resolvemos apresentar este caso&#46;</p></span></span>"
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        "resumen" => "<span><span class="elsevierStyleSectionTitle">Introdu&#231;&#227;o</span><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Os mixomas pulmonares s&#227;o tumores benignos muito raros e quase sempre de localiza&#231;&#227;o par&#234;nquimatosa&#44; mas ocasionalmente podem ocorrer na &#225;rvore traqueo-br&#244;nquica&#46; Est&#227;o descritos raros casos de mixomas pulmonares endobr&#244;nquicos na literatura m&#233;dica&#46;</p></span> <span><span class="elsevierStyleSectionTitle">Caso cl&#237;nico</span><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Doente do sexo feminino&#44; de 40 anos&#44; com hist&#243;ria de asma e pneumonias de repeti&#231;&#227;o &#224; direita&#46; A tomografia computadorizada &#40;TC&#41; do t&#243;rax revelou atelectasia do lobo m&#233;dio&#46; A broncofibroscopia revelou les&#227;o tumoral polip&#243;ide&#44; de limites bem definidos&#44; causando obstru&#231;&#227;o total do br&#244;nquio lobar m&#233;dio&#46; A biopsia do tumor n&#227;o foi diagn&#243;stica&#46; A tomografia por emiss&#227;o de positr&#245;es &#40;PET&#41; demonstrou atividade metab&#243;lica baixa do tumor e aus&#234;ncia de evid&#234;ncia de malignidade noutros locais&#46; A doente foi submetida a lobectomia m&#233;dia e o exame microsc&#243;pico do tumor revelou um padr&#227;o lobular com c&#233;lulas alongadas e estreladas&#44; tipo fibroblasto&#44; com estroma mixoide intercelular abundante&#44; compat&#237;vel com mixoma pulmonar&#46;</p></span> <span><span class="elsevierStyleSectionTitle">Conclus&#227;o</span><p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">O mixoma pulmonar &#233; muito raro e a sua localiza&#231;&#227;o endobr&#244;nquica est&#225; descrita em poucos casos na literatura m&#233;dica&#46;</p></span>"
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        "resumen" => "<span><span class="elsevierStyleSectionTitle">Introduction</span><p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">Pulmonary myxoma is an extremely rare benign neoplasm&#46; It is mostly parenchymal but may occasionally occur within the tracheobronchial tree&#46; There are very few reports of endobronchial myxoma&#46;</p></span> <span><span class="elsevierStyleSectionTitle">Case report</span><p id="spar0025" class="elsevierStyleSimplePara elsevierViewall">We describe a case of endobronchial myxoma in a 40-year-old female patient with a history of asthma and repeated right-sided pneumonia&#46; Thoracic computed tomography &#40;CT&#41; showed medium lobe atelectasis&#46; Fiber optic bronchoscopy revealed a polypoid&#44; well-circumscribed tumor&#44; causing total obstruction of the medium lobe bronchus&#46; Biopsy of the mass was non-diagnostic&#46; Further study included a positron emission tomography &#40;PET&#41; which demonstrated low metabolic activity of the tumor and no evidence of neoplasia in other location&#46; The patient was submitted to a medium lobectomy and microscopic examination of the tumor revealed myxoid stroma with lobulated pattern&#44; elongated and stellate cells&#44; compatible with myxoma&#46;</p></span> <span><span class="elsevierStyleSectionTitle">Conclusion</span><p id="spar0030" class="elsevierStyleSimplePara elsevierViewall">Pulmonary myxoma is extraordinary rare and endobronchial location is very few reported in medical literature&#46;</p></span>"
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Article information
ISSN: 08732159
Original language: Portuguese
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