[Laparoscopic pyeloplasty for ureteropelvic junction obstruction with crossing vessel and parapelvic cyst].

A 52-year-old male presented with flank pain and was diagnosed as having right ureteropelvic junction obstruction (UPJO) at another hospital. He underwent trans uretheral balloon dilation, but the symptom recurred. Thereafter, he was referred to our hospital for additional treatment. Abdominal dynamic computed tomography showed right hydronephrosis. The ureteropelvic junction seemed to be caught between a parapelvic cyst and crossing vessel. We successfully performed laparoscopic pyeloplasty with unroofing of the parapelvic cyst. To date, the patient has remained free of symptoms for four months postoperatively.