[Acute abdomen secondary to pyonephrosis. Perinephritic abscess with fistula to peritoneal cavity]

To describe a case of acute abdomen arising from an underlying urological condition.

Herein we describe a patient with acute abdomen arising from a pyonephrotic kidney with fistulization to the peritoneal cavity. The clinical manifestations disappeared following nephrectomy by the anterior approach and drainage of the intraperitoneal cavity.

Although infrequent, it should be taken into account that peritoneal abscess and/or pyonephrosis can cause acute abdomen when they fistulize to the peritoneal cavity.