Primary gastric melanoma: a case report of a rare malignancy / Melanoma gástrico primário: relato de caso de uma neoplasia maligna rara

ABSTRACT Noncutaneous melanoma is a rare clinical entity, and their primary or secondary nature is often difficult to establish. Few cases of primary gastric melanoma have been described in the literature. We report a case of a 55-year-old male patient with dyspepsia complaints. Esophagogastroduodenoscopy revealed a polypoid mass with blackened areas at the greater curvature of the gastric body, which was histologically compatible with melanoma; positive immunohistochemistry for S100, melan-A, and vimentin. The extensive dermatological exam did not identify a primary lesion.

RESUMEN El melanoma extracutáneo es una entidad clínica rara, y es difícil identificar su naturaleza primaria o secundaria. Hay pocos casos de melanoma gástrico primario descritos en la literatura. Reportamos el caso de un paciente masculino, de 55 años de edad con síntomas dispépticos. La esofagogastroduodenoscopia reveló lesión polipoidea con zonas ennegrecidas en la curvatura mayor del cuerpo gástrico, histológicamente compatible con melanoma; inmunohistoquímica positiva para S100, melan-A y vimentina. El examen dermatológico completo no identificó lesión primaria.

RESUMO Melanoma extracutâneo é uma entidade clínica rara, e sua natureza primária ou secundária é difícil de ser estabelecida. Poucos casos de melanoma gástrico primário são descritos na literatura. Relatamos o caso de um paciente do sexo masculino, 55 anos, com queixas dispépticas. A esofagogastroduodenoscopia revelou lesão polipoide com áreas enegrecidas na grande curvatura do corpo gástrico, histologicamente compatível com melanoma; imuno-histoquímica positiva para proteína S100, melan-A e vimentina. O exame dermatológico extenso não identificou lesão primária.

Bilateral pulmonary alveolar infiltrate and prostate tumour in a 54-year-old man.

THIS CASE STUDY DESCRIBES THE ASSOCIATION BETWEEN TWO RARE ENTITIES: pulmonary alveolar proteinosis (PAP) and embryonic rhabdomyosarcoma of the prostate in a 54 year old male presenting with pulmonary symptoms and obstructive urinary symptoms. The prostate tumour was treated with a radical cystectomy and adjuvant chemotherapy and radiotherapy. The patient did not wish to have treatment for his pulmonary disease and died 1 year after surgery as a result of intra-abdominal spread of the neoplasm.