Figure 031_4_7088. Types of fistula in ano. Type 1 , intersphincteric fistula. Type 2 , transsphincteric fistula. Type 3 , suprasphincteric fistula. Type 4 , extrasphincteric fistula. Illustration courtesy of Dr Shannon Zhang. - McMaster Textbook of Internal Medicine

Figure 031_4_7088.
Types of fistula in ano. Type 1, intersphincteric fistula. Type 2, transsphincteric fistula. Type 3, suprasphincteric fistula. Type 4, extrasphincteric fistula. Illustration courtesy of Dr Shannon Zhang.

Figure 031_4_7088. Types of fistula in ano. Type 1 , intersphincteric fistula. Type 2 , transsphincteric fistula. Type 3 , suprasphincteric fistula. Type 4 , extrasphincteric fistula. Illustration courtesy of Dr Shannon Zhang.