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NAACCR Data Dictionary
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Version 25
Data Item #3823: Circumferential Resection Margin (CRM)

* indicates required field

Length: 4
Source of Standard: NAACCR
Section Name: Stage/Prognostic Factors
Year Implemented: 2018
Version Implemented: 18
Record Types: A, M, C, I

XML NAACCR ID: circumferentialResectionMargin

Parent XML Element: Tumor

Required Status:

NPCR Collect: . - No recommendations
CoC Collect: RS - Required, site specific
SEER Collect: RS - Required, site specific
CCCR Collect: RS* - Required, site specific; when available

Description:

Circumferential or Radial Resection Margin, the distance in millimeters between the leading edge of the tumor and the surgically dissected margin as recorded on the pathology report, is a prognostic indicator for colon and rectal cancer. This may also be referred to as the Radial Resection Margin or surgical clearance.

Rationale:

Circumferential or Radial Resection Margin is a Registry Data Collection Variable in AJCC. It was previously collected as Colon and Rectum CS SSF# 6.

Item Data Type:

text

Allowable Values

0.0, 0.1-99.9, XX.1, XX.2, XX.3, XX.4, XX.5, XX.6, XX.7, XX.8, XX.9

Codes:

0.0

Circumferential resection margin (CRM) positive
Margin IS involved with tumor
Described as "less than 1 millimeter (mm)"

0.1-99.9

Distance of tumor from margin: 0.1- 99.9 millimeters (mm)
(Exact size to nearest tenth of millimeter)

XX.0

100 mm or greater

XX.1

Margins clear, distance from tumor not stated
Circumferential or radial resection margin negative, NOS
No residual tumor identified on specimen

XX.2

Margins cannot be assessed

XX.3

Described as "at least" 1 mm

XX.4

Described as "at least" 2 mm

XX.5

Described as "at least" 3 mm

XX.6

Described as "greater than" 3 mm

XX.7

No resection of primary site
Surgical procedure did not remove enough tissue to measure the circumferential or radial resection margin
(Examples include: polypectomy only, endoscopic mucosal resection (EMR), excisional biopsy only, transanal disk excision)

XX.8

Not applicable: Information not collected for this case
(If this information is required by your standard setter, use of code XX.8 may result in an edit error.)

XX.9

Not documented in medical record
Circumferential or radial resection margin not assessed or unknown if assessed

Code Notes:

Each Site-Specific Data Item (SSDI) applies only to selected primary sites, histologies, and years of diagnosis. Depending on applicability and standard-setter requirements, SSDIs may be left blank.