A 85-year-old woman suffered persisting pain in her left hip after a fall. On X-ray no fracture was seen. Her infection parameters were high and she developed a delirium and a painful swelling on her left hip. Examination with ultrasound showed free gas in the soft tissue of the left hip. A CT-scan of the abdomen and left upper leg showed a ruptured abscess in the left kidney with free gas, spreading through the M. iliopsoas into the upper left leg. On request of the patient and her family no treatment was given.