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Fig. 1C. —Selected schematic diagrams based on classification system by Parks et al. [3] illustrating most commonly encountered fistulas in our study population. (Reprinted with permission from [1]) Illustration of complicated extrasphincteric fistula shows that in this type of fistula, infection of intersphincteric anal glands crosses both sphincters and spreads caudally to perineum and cranially to point above levator ani muscle at which it opens secondarily into rectum.

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