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Adenocarcinoma (ADC) of the anal canal is a rare disease comprising only 5% of all anorectal neoplasias and 1.5% of all gastrointestinal tumors. The World Health Organization classifies anal ADC into 3 types: the first may arise from the mucosa of the transitional zone in the upper canal, the second from the anal glands (ducts) and the last can develop in the environment of a chronic anorectal fistula...
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