Most common causative organism is E. coli (60%). Others are Staphylococcus, Bacteroides, Streptococcus, B. proteus. Commonly occurs due to infection of anal gland in perianal region. 95% of anorectal abscesses are due to infection of anal glands in relation to crypts Cryptoglandular disease. Common in diabetics and immunosuppressed.
Subcutaneous collection Ischiorectal Abscess.
Lies between skin and levator Ani Submucosal Abscess. lies above dentate line Pelvirectal abscess – above levator ani muscle and pelvic peritoneum
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