→(b) Drainage of supralevator abscess by the transanal opening of intersphincteric space with fistulotomy from dentate line to the anal verge, irrespective of intersphincteric or
transsphincteric extension, as presently suggested
11.1 Deep Postanal Abscess
The rupture of a low intersphincteric abscess between the superficial and deep part of the external anal sphincter may form a deep postanal abscess [28].