Perinephric Abscess

Excerpt

Perinephric abscess results from perirenal fat necrosis. A perinephric abscess is usually a complication of urologic infection. Most perirenal abscesses were due to prolonged bacteremia with Staphylococcus aureus followed by hematogenous seeding before the era of antibiotics. More than 75% of perinephric abscesses are now due to complications of urinary tract infection. A perinephric abscess is more diffuse and affects the renal capsule and Gerota’s fascia. These abscesses can extend from the Gerota’s fascia into the psoas and transversalis muscles as well as the peritoneal cavity and the pelvis.