NAACCR Item #3823: Circumferential Resection Margin (CRM)

Item # Length Source of Standard Year Implemented Version Implemented Year Retired Version Retired
3,823 4 NAACCR 2018 18

NAACCR XML: Tumor.circumferentialResectionMargin


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.


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


0.0Circumferential resection margin (CRM) positive Margin IS involved with tumor Described as "less than 1 millimeter (mm)"
0.1-99.9Distance of tumor from margin: 0.1- 99.9 millimeters (mm) (Exact size to nearest tenth of millimeter)
XX.0100 mm or greater
XX.1Margins clear, distance from tumor not stated Circumferential or radial resection margin negative, NOS No residual tumor identified on specimen
XX.2Margins cannot be assessed
XX.3Described as "at least" 1 mm
XX.4Described as "at least" 2 mm
XX.5Described as "at least" 3 mm
XX.6Described as "greater than" 3 mm
XX.7No 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.8Not 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.9Not documented in medical record Circumferential or radial resection margin not assessed or unknown if assessed

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.