Table 1.
Classification of fistula according to type of surgery required based on their anatomic/physiologic location [15]
| Fistula type or size | Sub-category | Description |
|---|---|---|
|
Type I |
|
Fistula not involving the closing mechanism |
|
Type 11 A |
|
Fistula without (sub)total urethral involvement |
|
a |
without circumferential defect* |
|
|
b |
with circumferential defect |
|
|
Type 11 B |
|
Fistula with (sub)total urethral involvement |
|
a |
without circumferential defect* |
|
|
b |
with circumferential defect |
|
|
Type III |
|
Miscellaneous, e.g. ureteric and other exceptional fistula |
|
Small |
|
<2 cm |
|
Medium |
|
2–3 cm |
|
Large |
|
4–5 cm |
| Extensive | 6 or more cm |
* Circumferential defect: the complete separation of the urethra from the bladder.