WHO classification of anal canal tumors
Dr Amir Rezaee et al.
The World Health Organization 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
- squamous cell carcinoma of anal canal
- adenocarcinoma of anal canal
- mucinous adenocarcinoma of anal canal
- small cell carcinoma of anal canal
- undifferentiated carcinoma of anal canal
Non-epithelial tumors
Carcinoid tumors
Melanoma
Secondary tumors
- direct extension from adjacent organs: rectal, cervical, and prostate carcinomas
See also
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