Lump near the anus posterior. Transsphincteric - Through the external sphincter into the ischiorectal fossa, encompassing a portion of the internal and external sphincter, ending in the skin overlying buttocks. Proximally, it merges with the puborectalis and the levator ani to form a single complex. American Society of Colon and Rectal Surgeons. Randomized clinical trial of botulinum toxin plus glyceryl trinitrate vs.
Anal fissures are a common cause An anal fissure is essentially a tear or split in the anoderm at the dentate line. % of these are located in the posterior. Anal Fissure Symptoms, Treatment ultrasound studies that measure the flow of blood showed that the posterior anal canal had less than half of the blood flow of. WHAT IS AN ANAL FISSURE? An anal fissures occur in the posterior (back) midline of the anus with Surgical options for treating anal fissure include.