Tumour

Site

— 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.

Figure 7.1. The anatomy of the anal canal. (Williams GR, Talbot IC. Anal carcinoma: a histological review. Histopathology 1994;25:507-516 Reproduced with permission from Blackwell Publishing Ltd)
Figure 7.2. Anal canal carcinoma: overlap in histological subtypes. (Williams GR, Talbot IC. Anal carcinoma: a histological review. Histopathology 1994;25:507-516 Reproduced with permission from Blackwell Publishing Ltd)

Size

— length x width x depth (cm) or maximum dimension (cm). Appearance

— polypoid/sessile/ulcerated/stricture/pigmented/ fleshy/mucoid. Edge

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