[Inverted Y ureteral duplication with a ureteral stone in atretic segment: a case report].

A 46-year-old male was admitted with the chief complaint of right side abdominal pain. A retrograde urogram disclosed right hydronephrosis and an anomalous branch in the shape of an inverted Y accompanied by a calculus on the right ureter. Extirpation of the calculus and vesicoureteroneostomy were performed just above the bifurcation. The anomalous branch was blind-ending.