[Renal leiomyoma. Report of a new case]

Though renal leiomyoma is an unusual tumour, symptomatic tumours are even more uncommon. They often raise problems with differential diagnosis from malignant tumours which not even the most advanced imaging techniques manage to elucidate. On the other hand, their sarcomatous degeneration has been described. Considering these premises, doubts arise on their therapeutical approach, on which we here present our own views.