Anal Mucosa

An anal adenocarcinoma characterized by the presence of mucoid stroma formation.

The dorsal part of the cloacal membrane following its partition by the urorectal septum.

A melanoma arising from the anus. Clinical presentation includes rectal bleeding, tenesmus, pain, and change in bowel habit. The prognosis…

A squamous cell carcinoma arising from the perianal skin.

A carcinoma arising in the anal margin or perianal skin (below the anal verge and involving the perianal hair-bearing skin). It…

A precancerous neoplastic intraepithelial process involving the squamous epithelium of the perianal skin. Clinically, it usually presents as a white or red…