[Leiomyoma of the renal capsule. Presentation of a case and review of the literature].

Leiomyoma of the renal capsule is rare and very difficult to diagnose preoperatively. We report on a patient in whom a solid renal mass had been incidentally detected during ultrasound evaluation for a gastroenterological condition. A CT scan confirmed the presence of a solid mass. The intraoperative biopsy showed it was a benign tumor and conservative surgery was performed. According to the literature, this tumor type has, as yet, not been diagnosed preoperatively. However, some angiographic features may indicate the presence of this condition. This is the fourth case of leiomyoma of the renal capsule reported in the literature and the second case treated by conservative surgery.