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Anal Transitional Zone
The middle segment of the anal canal between the colorectal and squamous zones. (NCI Thesaurus)
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Narrowing of the anal canal.
The lower third segment of the anal canal. It is covered with stratified squamous epithelium.
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.
