Parks Classification of Perianal Fistulas • Superificial (Simple) - Superficial fistula w/o crossing any sphincter or muscular structure • Intersphincteric (Simple) - Fistula tract b/w internal anal sphincter and external anal sphincter → in intersphincteric space • Trans-Sphincteric (simple if low, complex if high) - Fistula tract crosses the external anal sphincter • Supra-Sphincteric (complex) - Fistula tract penetrates the intersphincteric space and continues over the top of the puborectalis → penetrates the levator muscle before reaching the skin • Extra-Sphincteric (complex) - Fistula tract outside the external anal sphincter → penetrating the levator muscle #Parks #Classification #Perianal #Fistulas #IBD #Crohns #diagnosis #gastroenterology
