Resumo

PARADA, David et al. Primary Ewing´s sarcoma/Primitive neuroectodermal tumor of the kidney: An infrequent finding. Arch. Esp. Urol. [online]. 2007, vol.60, n.3, pp.321-325. ISSN 0004-0614.

Objetive: Ewing´s sarcoma/Primitive neuroectodermal tumor (ES/PNET) is an extraordinarily rare primary tumor in the kidney. We re-port herein the clinical, histological, and immunohisto-chemical features of a primary renal ES/PNET. Methods: A 19-year old male referred a two weeks history of constant, colic, left flank pain, and fever. A left radical nephrectomy was performed. Gross pathologic examination showed pink-tan, lobulated solid tumor, lo-calized at the superior pole. Results: Histologically, the tumor was solid with necrosis. The neoplastic cells showed a small amount of clear cytoplasm, and had vesicular nuclei with small nucleoli. Immunohistochemical studies showed strongly and diffusely positive staining for CD99 in a membranous pattern. Conclusions: This case represents a typical ES/PNET, affecting a young male patient. Adequate diagnosis is important because this neoplasm has an aggressive behaviour.

Palavras-chave : Kidney; Ewing´s Sarcoma; Primitive neuroectodermal tumor; CD99; Immunohistochemestry.

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