Circumferential resection margin

The circumferential resection margin (CRM) is a term used in rectal carcinoma excision surgery (such as total mesorectal excision (TME).

Pathologic evaluation of the resection margin on the excised rectum has been considered important for determining the risk of local recurrence. A margin of ≤1 mm is considered by some to be a negative prognostic factor for local recurrence 2.

The prognostic value of the CRM has been called into question in some recent studies 3.

The CRM is not valid for excised colon covered by a peritoneal lining.

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Article information

rID: 37677
Section: Pathology
Synonyms or Alternate Spellings:
  • CRM
  • Radial resection margin
  • Circumferential resection margin (CRM)

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Cases and figures

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    Figure 1: resected rectal specimen, gross pathology
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