A 73-year-old woman was referred to our hospital for treatment of a 12 mm stone in the right ureteropelvic junction and pyonephrosis. A double-J ureteral stent was indwelled for right hydronephrosis and emphysematous pyelonephritis. After antibiotic treatment, flexible transurethral lithotripsy (f-TUL) was performed and all the stones were disintegrated and extracted without any complications. On the day after f-TUL, severe back pain occurred, and computed tomography revealed subcapsular hematoma and renal pseudoaneurysm. Angiography and selective embolization of the bleeding artery were performed to control the bleeding.
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