Ihe anal margin neoplasms may present as persistent ulcers or as chronic dermatologic conditions such as eczema or mycotic infections. Any ulcer that fails to heal within 30 days or any discrete skin lesion that fails to improve with appropriate therapy must be biopsied to rule out the presence of malignancy.
Virtually all anorectal tumors can be detected by careful visual examination of the perianal area, digital palpation of the distal rectum and anal canal, and procto- or sigmoidoscopic examination. In one review of anal malignancies, 80 percent were in the canal and 20 percent at the anal margin. Failure to look, feel, and think would be the only reason not to suspect the presence of these curable but life-threatening lesions.
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