Atraumatic retroperitoneal haemorrhage in a hydronephrotic kidney secondary to transitional cell carcinoma.

Retroperitoneal haemorrhage due to rupture of a hydronephrotic kidney has been described previously. There have only been two previous cases reporting retroperitoneal haemorrhage secondary to transitional cell carcinoma. We report two cases of spontaneous retroperitoneal haemorrhage in grossly hydronephrotic kidneys which had extensive transitional cell carcinoma present in the renal pelvis.