[Emphysematous cystitis in a patient with renal transplant].

We describe a renal transplant patient who developed an abdominal pain in the hypogastrium area and a urinary tract infection. An abdominal RX, and later, a computerized tomography showed an air collection in the bladder wall. Emphysematous cystitis is a rare complication of the urinary tract infection, more frequently in patients with diabetes mellitus. It is important to treat it since the beginning, so we can avoid several complications.