Table 2 Characteristics of the low-type intersphincteric perianal fistulas.
From: Ultrasound assessment of low type intersphincteric perianal fistulas in Yemen
Variable | Number (n = 581) | Percentage (%) |
|---|---|---|
Number of EO per fistula | ||
1 | 555 | 79.10 |
2 | 25 | 4.30 |
3 | 1 | 0.17 |
Site of EO around the anus (/quadrant) | ||
LAQ (1–3 O’clock) | 183 | 31.5 |
LPQ (4–6 O’clock) | 169 | 29.1 |
RPQ (7–9 O’clock) | 124 | 21.3 |
RAQ (10–12 O’clock) | 105 | 18.1 |
Site of EO around the anus (12 h) | ||
1 O’clock | 81 | 13.9 |
2 O’clock | 50 | 8.6 |
3 O’clock | 52 | 9.0 |
4 O’clock | 30 | 5.2 |
5 O’clock | 56 | 9.6 |
6 O’clock | 83 | 14.3 |
7 O’clock | 55 | 9.5 |
8 O’clock | 29 | 5.0 |
9 O’clock | 40 | 6.9 |
10 O’clock | 51 | 8.8 |
11 O’clock | 41 | 7.1 |
12 O’clock | 13 | 2.2 |
Number of IO per fistula | ||
1 | 579 | 99.65 |
2 | 2 | 0.34 |
Distance of IO from the anal verge (mm) | ||
1–10 mm | 159 | 27.4 |
11-20mm | 340 | 58.5 |
21-30mm | 63 | 10.8 |
31-40mm | 18 | 3.1 |
41-50mm | 1 | 0.2 |
Length of the tract of fistula (/mm) | ||
1–10 mm | 28 | 4.8 |
11–20mm | 159 | 27.4 |
21–30mm | 175 | 30.1 |
31–40mm | 145 | 25.0 |
41–50mm | 49 | 8.4 |
51–60mm | 12 | 2.1 |
61–70mm | 9 | 1.5 |
71–80mm | 4 | 0.7 |
