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Primary osteosarcoma of the thyroid gland: report of a rare neoplasm Osteossarcoma primário da glândula tireoide: relato de uma neoplasia rara

By Eduardo Cambruzzi, João Grigoleti Scholl, Alberto Salgueiro Molinari and Karla Lais Pêgas

Abstract

Primary mesenchymal tumors of the thyroid gland are extremely rare. The authors report a case of primary thyroid osteosarcoma in a male patient presenting a tumoral mass in the neck. CT scan demonstrated a large tumor in the right thyroid lobe with areas of calcification. The surgical specimen consisted of a hard brown-gray tumor, measuring 13 × 11 × 7.5 cm. Microscopy revealed a high-grade malignant neoplasm composed of polygonal cells of intermediate size, chondroid pattern in some areas and osteoid formation. The process was immunonegative for AE1/AE3, glial fibrillary acidic protein (GFAP), epithelial membrane antigen (EMA), p53 and thyroid transcription factor-1 (TTF-1), and immunopositive for CD99 and S100. Thus the diagnosis of primary osteosarcoma of the thyroid gland was established.<br>Tumores mesenquimais da glândula tireoide são extremamente raros. Os autores relatam um caso de osteossarcoma primário de tireoide em um paciente masculino que apresentou massa tumoral na região cervical. A tomografia computadorizada demonstrou um grande tumor no lobo tireoideano direito, com zonas de calcificação. A peça cirúrgica consistia de um tumor marrom-acinzentado e firme, medindo 13 × 11 × 7,5 cm. À microscopia, foi encontrada neoplasia maligna de alto grau composta por células poligonais de tamanho intermédio, com um padrão condroide em algumas áreas e formação de osteoide. O processo revelou imunoexpressão negativa para AE1/AE3, proteína glial fibrilar ácida (GFAP), antígeno da membrana epitelial (EMA), p53 e fator de transcrição da tireoide (TTF-1) e imunopositividade para CD99 e S100. O diagnóstico de osteossarcoma primário da glândula tireoide foi, então, estabelecido

Topics: osteossarcoma, glândula tireoide, patologia, imuno-histoquímica, osteosarcoma, thyroid gland, pathology, immunohistochemistry, Pathology, RB1-214, Medicine, R, DOAJ:Pathology, DOAJ:Medicine (General), DOAJ:Health Sciences
Publisher: Sociedade Brasileira de Patologia Clínica
Year: 2013
OAI identifier: oai:doaj.org/article:0ecdab657d5f454baa6203950115b29c
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