URETEROPELVIC JUNCTION OBSTRUCTION IN UPPER AND LOWER MOIETY OF DUPLEX RENAL SYSTEMS

Objectives. To review our experience with ureteropelvic junction obstr uction in a duplicated renal collecting system. Methods. The records o f 7 patients with ureteropelvic junction obstruction in a duplex colle cting system were reviewed. In addition to routine demographics, each case was reviewed for presenting symptoms, site of obstruction, and ty pe of surgical treatment. Results. Three of the 7 cases involved obstr uction of the upper pole moiety, and the remaining 4 involved the lowe r pole segment of a duplex system. Obstruction of the up per and lower pole segments was found in both incomplete and complete duplicated co llecting systems. Conclusions. Careful preoperative evaluation of pati ents with ureteropelvic junction obstruction will usually identify seg mental obstruction in a duplicated system. Treatment should be individ ualized based on site of obstruction and degree of function remaining in the affected segment.