— mucous membrane/muscularis/extramural.
— low rectal/anal canal/perianal margin or skin.
1. upper zone: colorectal mucosa
2. transitional/cloacal zone: stratified cuboidal epithelium with surface umbrella cells + anal glands in submucosa _dentate (pectinate) line_
3. lower zone: stratified squamous epithelium continuous with appendage bearing perianal skin.
— length x width x depth (cm) or maximum dimension (cm). Appearance
— polypoid/sessile/ulcerated/stricture/pigmented/ fleshy/mucoid. Edge
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