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©2013 UpToDate ® Print Email Parks' classification of anal rectal fistulas, anterior view Parks described four types of anal rectal fistulas that originate from crpytoglandular infections. Fistulas can have a complicated anatomy with one or more extensions and accessory tracts. The original Parks' classification did not include a superficial fistula tract. Type 1 is an intersphincteric fistula that travels along the intersphincteric plane. Type 2 is a transphincteric fistula that encompasses a portion of the internal and external sphincter. Type 3 is a suprasphincteric fistula that encompasses the entire sphincter apparatus. Type 4 is an extrasphincteric fistula that extends from a primary opening in the rectum, encompasses the entire sphincter apparatus, and opens onto the skin overlying the buttock.