Tumours of the kidney may arise from the renal parenchyma or from the urothelial lining of the collecting system. They account for about 3% of all malignancies.
The most important renal parenchymal tumours are:
Transitional cell carcinoma is the only important tumour of the renal pelvis. It accounts for 5% of all primary renal tumours, and often presents late. It is discussed with other urothelial tumours.
Angiomyolipoma is an important benign tumour.
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