Focal bacterial nephritis masquerading as renal cell carcinoma: case report.

Focal bacterial nephritis is a symptom associated with inflammation of the kidneys. It may occur in children, usually indicating abnormal urinary tract development. In adults, urinary tract infection is generally caused by gram-negative bacteria, with Escherichia (E.) coli accounting for 80% of all infections. This case report describes a female patient in whom E. coli urinary infection caused, via ascending route, focal bacterial nephritis masquerading as renal cell carcinoma.