Guidelines on postoperative magnetic resonance imaging in patients operated for cryptoglandular anal fistula: Experience from 2404 scans

Table 3 Characteristics of operated anal fistula patients analyzed by magnetic resonance imaging

Parameter	Patients (n = 1255)
M/F	1078/177
Recurrent (%)	754 (60.1)
Associated abscess (%)	328 (25.7)
Multiple fistula tracts (%)	777 (61.9)
Horseshoe tract (%)	285 (22.7)
Supralevator or suprasphincteric tract (%)	162 (12.9)
Simple/complex fistulas	621/ 634
Fistula classification as per different classifications
St James’s University Hospital	I-193
	II-180
	III-150
	IV-570
	V- 162
Parks	I-375
	II-698
	III-162
	IV-0
Garg	I-265
	II-390
	III-83
	IV-355
	V- 162

Garg classification is a recently proposed classification (2017), which has been shown to correlate accurately with fistula complexity[15,16]. F: Female; M: Male.