[Large renal leiomyoma].

Renal leiomyomas are uncommon between renal tumors, and they have a benign mesenchymatous origin. Because of their low incidence, unspecific symptomatology an not well-defined iconographic semiology, they often raise problems with differential diagnosis from kidney masses, although they are often big size lessions. We report a patients with incidentally diagnosis of big solid left renal mass, who underwent radical nephrectomy resulting kidney pelvis leiomyoma. Diagnostic, histological and therapeutic aspects are briefly review in literature. Emphasis is made on the relevance of a high index suspicion considering big solid asymptomatic renal masses in middle-age women. Specially in renal tumors with well-defined limits and abscence of locoregional and systemic dissemination. We emphasized usefulness of Magnetic Angioresonance, immunohystochemical test and conservative surgery opportunity in small renal leiomyomas preoperatively confirmed.