A 4l-Year-Old Woman Was Seen in the Emergency Department Complaining

A 4l-year-old woman was seen in the emergency department complaining of a painful swelling in the region of the anus. On examination, a hot, red, tender swelling was found on the right side of the anal margin. A diagnosis of ischiorectal abscess was made.
-The following statements concerning this case are probably correct except which?

A) An ischiorectal abscess is a common complication of anal fissure.
B) The fat in the ischiorectal fossa is prone to infection that might extend laterally through the base of the anal fissure.
C) The fat in the ischiorectal fossa has a profuse blood supply.
D) A surgical incision of the abscess should provide adequate drainage of the pus.
E) The surgeon should avoid the inferior rectal nerve and vessels that cross the ischiorectal fossa from the lateral to the medial side.