Balloon catheter dilatation is now an accepted method for treating str
ictures of the upper urinary tract. A successful result was obtained i
n 34 (85%) of 40 patients with symptomatic stricture. The number of di
latations required for improved runoff from the kidney was one in 26 c
ases, two in six cases and three in one case. One patient had a perman
ent stent and six required a conventional operation. There were seven
recurrences of stricture, all within 4 months after the dilatation. On
e of these patients reqUiTed nephrectomy because of nonfunctioning kid
ney.