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Anal Squamous Zone
The lower third segment of the anal canal. It is covered with stratified squamous epithelium. (NCI Thesaurus)
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A squamous cell carcinoma (SCC) arising from the anal canal or the anal margin (perianal skin). Human papillomavirus is detected in the…
Furrows, with pouchlike recesses at the lower end, separating the rectal columns.
A malignant mesenchymal neoplasm arising from the anus. Representative examples include leiomyosarcoma, rhabdomyosarcoma, and Kaposi sarcoma.
A malignant mesenchymal tumor with skeletal muscle differentiation affecting the anus.
The area that includes the anus and the perianal skin.
A non-neoplastic or neoplastic polypoid lesion that arises from the anus. Representative examples include the fibroepithelial polyp and squamous papilloma. …
