Antenatal diagnosis of renal pelvic dilatation--the natural history of conservative management.

Seventy children with an antenatal diagnosis of unilateral renal pelvic dilatation underwent Tc 99 m DTPA diuretic renograms. There were 16 kidneys with moderate function, and 54 with good function, 31 underwent pyeloplasty, all had a renal pelvis greater than 12 mm diameter on ultrasound. Thirty nine children with good function were treated conservatively. Long term follow up has demonstrated that conservative management for PUJ dilatation with a good functioning kidney may be justified but a randomised control study is required.