Enrolled (n)

Percentage (%)

Obstructive urolithiasis

27

34.2

Abdominal-pelvic tumour

17

21.5

SJPU

12

15.2

Urethral stricture

9

11.4

UHN viewed without obstacle

8

10.1

Retroperitoneal fibrosis

3

3.8

Others

3

3.8

Total

79

100