[Thyroid carcinoma with thymus-like differentiation (CASTLE): case report and review of the literature]. / Carcinoma da tireóide com diferenciação semelhante a timo (CASTLE): relato de caso e revisão da literatura.

Carcinoma with thymus-like differentiation (CASTLE) is a rare malignant epithelial tumor which arises on soft tissue of the neck or thyroid gland. It is important to differentiate CASTLE from primary or metastatic squamous cell carcinoma of head and neck, and from squamous cell thyroid carcinoma, because it has a different prognosis. CD5 immunoreactivity might be helpful in CASTLE diagnosis. CASTLE behaves generally in an indolent fashion, even though it has a high relapse rate, while the other have a dismal prognosis due its high dissemination rate. Treatment includes surgical excision and radiotherapy. Chemotherapy can be offered, although its efficacy is not clear. Authors present a case of a 52 year-old male that complaints with cough, disphony, asthenia, and thyroid mass. Thyroidectomy was performed and the pathology revealed a CASTLE. After radiotherapy and chemotherapy, minimal response was obtained. The authors intend to discuss the differential pathologic diagnosis and the best therapy of this indolent but recurrent neoplasm, that demands strict long term follow-up.

Carcinoma da tireóide com diferenciação semelhante a timo (CASTLE): relato de caso e revisão da literatura / Thyroid carcinoma with thymus-like differentiation (CASTLE): case report and review of the literature

O carcinoma com diferenciação semelhante a timo (CASTLE) é uma neoplasia epitelial maligna rara, que surge nos tecidos moles do pescoço ou na glândula tireóide. O diagnóstico diferencial deve ser estabelecido com carcinoma pavimento-celular primário ou secundário da cabeça e do pescoço ou da tireóide, visto que têm prognósticos distintos. A imunorreatividade para CD5 pode ser útil no diagnóstico de CASTLE. O CASTLE possui elevada taxa de recidiva local, apesar de o seu curso clínico indolente, ao contrário das neoplasias previamente referidas, que têm um prognóstico muito reservado, dada a elevada taxa de disseminação sistêmica. O tratamento inclui excisão cirúrgica e radioterapia. A quimioterapia também tem sido realizada, apesar de até a presente data não existir evidência clara da sua eficácia. Relata-se caso de doente de sexo masculino, com 52 anos, que surge com tosse seca, disfonia e massa da tireóide, que foi submetido à tireoidectomia. O exame anatomopatológico da peça operatória permitiu o diagnóstico de CASTLE. O doente efetuou radioterapia e quimioterapia e obteve resposta mínima. Pretende-se discutir o diagnóstico anatomopatológico diferencial e a abordagem terapêutica mais adequada de uma patologia com prognóstico favorável, mas de natureza recidivante, que exige seguimento rigoroso a longo prazo.

Carcinoma with thymus-like differentiation (CASTLE) is a rare malignant epithelial tumor wich arises on soft tissue of the neck or thyroid gland. It is important to differentiate CASTLE from primary or metastatic squamous cell carcinoma of head and neck, and from squamous cell thyroid carcinoma, because it has a different prognosis. CD5 immunoreactivity might be helpful in CASTLE diagnosis. CASTLE behaves generally in an indolent fashion, even though it has a high relapse rate, while the other have a dismal prognosis due its high dissemination rate. Treatment includes surgical excision and radiotherapy. Chemotherapy can be offered, although its efficacy is not clear. Authors present a case of a 52 year-old male that complaints with cough, disphony, asthenia, and thyroid mass. Thyroidectomy was performed and the pathology revealed a CASTLE. After radiotherapy and chemotherapy, minimal response was obtained. The authors intend to discuss the differential pathologic diagnosis and the best therapy of this indolent but recurrent neoplasm, that demands strict long term follow-up.