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What does PAC stand for?

PAC stands for proximal anal canal

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(Anorectal Abscess) An anal abscess is an infected cavity filled with pus found near the anus (the opening of the anal canal) or rectum (the portion of large intestine just proximal to the anal canal). This can results from a blockage of the anal glands located just inside the anus. According to the crypto-glandular theory, abscesses often develop from cryptitis which may be associated with an enlarged papillae in the anal canal.
The surgical anal canal begins at the anorectal ring, which is the upper end of the puborectalis muscle and internal anal sphincter. It continues to the anal verge. The perianal region, marked by skin with hair bearing appendages, extends 5 cm out-ward from the anal verge. The proximal anal canal is lined by a columnar epitheilum. At the dentate line, located one to two centimeters proximal to the anal verge, the mucosa transitions to a squamous epithelium.
the lower part of the large intestine, about 12 cm long, continuous with the descending sigmoid colon, proximal to the anal canal. It follows the sacrococcygeal curve, ends in the anal canal, and usually contains three transverse semilunar folds: one situated proximally on the right side, a second one extending inward from the left side, and the third and largest fold projecting caudally. Each fold is about 12 mm wide.