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Table 1 Classification of fistula according to type of surgery required based on their anatomic/physiologic location [15]

From: Obstetric Fistula in Burundi: a comprehensive approach to managing women with this neglected disease

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  23 cm
Large  45 cm
Extensive   6 or more cm
  1. * Circumferential defect: the complete separation of the urethra from the bladder.