[A CASE OF PYELONEPHRITIS AND ILIOPSOAS ABSCESS EXTENDING TO THE THIGH DUE TO IMPACTED URETERAL STONE, TREATED IN COLLABORATION WITH AN ORTHOPEDIC SURGEON].

A 80-year-old woman presented with a swelling and pain in the left thigh visited our hospital. CT showed an impacted stone in the left ureter, left hydronephrosis and abscess formation extending from the perirenal area to the left thigh. Immediately, the patient was admitted and left nephrostomy was placed. On day 3 of admission, drainage of abscess in the left thigh was performed with the cooperation of an orthopedic surgeon. On day 17, a contrast-enhanced CT showed shrinkage of the thigh abscess, however, showed the left non-functioning kidney and poor drainage of the left iliopsoas abscess. On day 24, open left nephrectomy and unroofing of the iliopsoas abscess were performed, and all the abscess showed shrinkage thereafter. To sum up, multiple drainage should be considered for widely extending abscess originated in the retroperitoneal space.