RT Book, Section A1 Doherty, Gerard M. SR Print(0) ID 58092143 T1 Anal Margin Cancer T2 Quick Answers Surgery YR 2010 FD 2010 PB The McGraw-Hill Companies PP New York, NY SN LK accesssurgery.mhmedical.com/content.aspx?aid=58092143 RD 2024/03/28 AB • Located at or outside the anal verge• Usually well-differentiated, keratinizing tumors• Behave similarly to squamous cell carcinomas of skin• Lesions may be present for long periods before symptoms develop• 4 types -Squamous cell-Basal cell-Bowen disease-Paget disease