WHO classification of anal canal tumors

Last revised by Daniel J Bell on 4 Oct 2021

The World Health Organizatiοn classifies anal canal neoplasms into intraepithelial neoplasms and invasive neoplasms which are further divided to epithelial and non-epithelial tumors and secondary lesions:

Epithelial tumors
Non-epithelial tumors
Carcinoid tumors
Melanoma 
Secondary tumors
  • direct extension from adjacent organs: rectal, cervical, and prostate carcinomas

See also

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