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Featuring Demian Dressler, DVM and Sue Ettinger, DVM, Dip. ACVIM (Oncology), authors of The Dog Cancer Survival Guide

Margin Definition

Margin: This refers to the area of normal-seeming tissue surrounding a tumor that has been removed during a biopsy or other surgery. This area may contain microscopic cancer cells, so, a pathologist examines it during a comprehensive margin evaluation. If the margins are narrow (one or two millimeters), malignant tumors are more likely to recur. For this reason, wide margins of two to three centimeters are preferred.

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