[Prolapse of simple ureterocele following transurethral incision].

The patient was a 35-year-old woman with complaints of residual sensation and pollakisuria. Excretory urography and magnetic resonance imaging revealed right ureterocele with hydronephrosis. Transurethral incision of the ureterocele was carried out. Two months postoperatively, the ureterocele prolapsed through the external urethral meatus, and transurethral resection of ureterocele was performed. Forty-one cases of prolapsed ureterocele reported in the Japanese literature are reviewed.