Abstract
Perianal skin is subject to virtually all of the diseases that affect skin in other areas of the body. The differential diagnosis of perianal skin is presented in Table 16-1. This list includes a variety of diagnoses, which almost never present as isolated perianal disease, but there are common diseases such as psoriasis that may present in isolation without obvious ties to other areas of the body unless a careful search is made. Successful treatment of perianal disease requires accurate diagnosis to eliminate diseases that have specific cause and treatment (e.g., psoriasis, candida, Bowen’s disease). Recognition of important treatable causes requires a disciplined, organized approach to diagnosis with frequent use of biopsy. This chapter’s objective is to lay out a strategy to facilitate accurate diagnosis and successful treatment of perianal and anal skin conditions. Implicit in this strategy is the ability to properly examine the anus with appropriate instruments and bright light and to understand diseases peculiar to the anal area, hence, the importance of the colorectal surgeon who has the skills to accomplish this task. The importance of complete, accurate evaluation is emphasized by a St. Louis University series in which a study of 209 patients with the presenting symptom of pruritus over a 2-year period revealed that 75% of patients had coexisting anal or colorectal pathology. The diagnoses included 11% with rectal cancer, 6% with anal canal cancer, and 2% with colon cancer, although the majority of patients had hemorrhoids or fissure.
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Finne, C.O. (2007). Perianal Dermatology and Pruritus Ani. In: Wolff, B.G., et al. The ASCRS Textbook of Colon and Rectal Surgery. Springer, New York, NY. https://doi.org/10.1007/978-0-387-36374-5_16
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DOI: https://doi.org/10.1007/978-0-387-36374-5_16
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