Renal liposarcoma of the sinus renalis.

We report on 42-month follow-up of a case of renal liposarcoma of the sinus renalis with tumour-free survival. It is a rare condition and occurs generally in the 4th and 6th decades of life. Renal liposarcomas are clinically asymptomatic for a long period of time. Symptoms develop only when the tumours become large enough, as in our case. For the differential diagnosis of renal liposarcoma we performed intravenous urography, computerized tomography and colour flow Doppler ultrasonography. After these diagnostic evaluations the patient underwent right radical nephrectomy. Complete surgical resection was performed. Final diagnosis was made by pathological examination. Because of the poor results of either chemotherapy or radiotherapy, we conclude that 42 months of tumour-free survival is related to complete surgical resection with negative surgical margins.