Excision Margin
The predetermined distance of normal tissue removed around a lesion during surgical excision.
Full Definition
An excision margin refers to the width of clinically normal-appearing tissue that is intentionally removed around a lesion during surgical excision to ensure complete tumor removal. Margin width is determined based on lesion type, size, location, histologic subtype, and risk factors for recurrence. For skin cancers, margins typically range from 3-5mm for low-risk basal cell carcinomas to 1-2cm or more for melanomas, depending on tumor thickness. Adequate margins are critical for achieving cure and preventing local recurrence, though they must be balanced against functional and cosmetic considerations.
Usage
Usage note: Specify both lateral and deep margins when documenting surgical procedures.
In Context
- "A 5mm excision margin was taken around the basal cell carcinoma as recommended by NCCN guidelines." — Operative note
- "Excision margins for melanoma should be determined based on tumor thickness and location." — Treatment planning documentation