<prompt> Most common anorectal fistula:Inter sphinctericTrans sphinctericSupra sphinctericExtra sphincteric  <response>: PARKS CLASSIFICATION Type 1 Inter- sphincteric MC Type 2 Trans- sphincteric Type3 Supra- sphincteric Type4 Extra- sphincteric Investigations - First investigation - Fistulogram - IOC- MRI Treatment High morbidity Fistulotomy -Incision over fistula tract it Fistulectomy- Excision of fistula tract. SETON VAAFT Video Assisted Anal Fistula Treatment 