Ureteral membranous band causing ureteral obstruction after the ureterolithotomy

A 45-year-old male admitted to our clinic of symptoms with moderate left flank pain and intermittant macroscopic hematuria. During the last 6 months these complaints had worsened. He had history of open retroperitoneal ureterolithotomy 2 years previously for ureteral stone. He was investigated for calculi, infection and other urinary abnormalities. Although direct urinary system graphy was normal, excretory urography revealed left ureteric obstruction. On ureteroscopy membranous band like an ureteral valve causing ureteral obstruction was observed and removed with biopsy pens without resection.