Chronic pyonephrosis associated with renal neovascularisation.

The spectrum of renal tract infections is wide. When the kidney has been severely damaged, the radiological findings may suggest a malignancy. To report a case of chronic pyonephrosis, which even at exploration appeared to be a malignancy. The case record of the patient as well as the literature were reviewed and reported. A 25 year-old woman presented with a 5-year history of left lumbar pain, urinary frequency and intermittent total haematuria. The intravenous urography showed non-function in the left kidney harbouring a calculus. Treatment was delayed for poor finances. At laparotomy a huge renal mass invading the colonic mesentery and showing neovascularisation was removed. The final diagnosis was chronic pyonephrosis. She recovered from postoperative septicaemia. Neovascularisation is a feature of malignant disease mediated by angiogenesis factors. These factors are probably present in chronic inflammation. It is suggested that for nephrectomy, prophylactic antibiotics should be used. There is also a need for histopathological examination of every specimen removed at operation.