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Leiomyoma of the anal canal originating from the internal anal sphincter is an extremely rare clinical entity. Generally, it does not produce any clinical signs unless it is large enough to cause obstruction, discomfort, bleeding or pain. The diagnosis is often made incidentally during rectal examination due to other perianal disease or check-up. Herein we report a case of internal anal sphincter leiomyoma diagnosed unexpectedly during rectal examination in a patient with perianal fistula, and treated successfully with surgical excision. We present a review of the literature, the diagnostic strategies, differential diagnosis, prognosis and treatment modalities of this lesion. Historically, gastrointestinal stromal tumors GISTs were incorrectly classified as leiomyomas or leiomyosarcomas [ 1 ] because they histologically possessed smooth muscle like structures.
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Anal cancer types

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Types of Anal Cancer: Common, Rare and More Varieties | CTCA

The abnormal growth of cells in the anus is called anal intraepithelial neoplasia AIN or anal squamous intraepithelial lesions SILs. Tumors that develop in or on the anus are either benign noncancerous or malignant cancerous. The different types of anal cancer , listed below, are based on the type of cells in which the cancer develops:. Squamous cell carcinoma begins in the outer lining of the anal canal. It is the most common type of anal cancer.
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What Is Anal Cancer?

Small cell, neuroendocrine tumors, and melanoma of the anus are rare. Limited data exists on incidence and management for these rare tumors. A large, prospective, population-based database was utilized to determine incidence and survival patterns of rare anal neoplasms. Incidence and survival patterns were evaluated with respect to age, sex, race, histology, stage, and therapy. Anal melanoma AM demonstrated lowest survival rate at 2.
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The inner lining of the anal canal is the mucosa. Most anal cancers start from cells in the mucosa. Glands and ducts tubes leading from the glands are found under the mucosa.
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