Margins of Excision

**Definition:** The edges of tissue removed in a surgery for assessment of the effectiveness of a surgical procedure in achieving the local control of a neoplasm and the adequacy of tumor removal. When the margin is negative or not involved by tumor (e.g., CANCER) it suggests all of the tumor has been removed by the surgery.

**Tree numbers:** - A10.830 - C23.149.625

**Synonyms:** - Surgical Margins - Resection Margin