ACR Appropriateness Criteria® Staging of Colorectal Cancer: 2021 Update

Area of Science:

• Oncology
• Radiology
• Medical Imaging

Background:

• Preoperative imaging plays a vital role in the accurate assessment of rectal carcinoma, including primary tumor evaluation and distant metastatic disease detection.
• For nonrectal colon cancer, preoperative imaging is primarily beneficial for identifying distant metastases, irrespective of the primary tumor's T or N stage.

Framework:

• The American College of Radiology Appropriateness Criteria provide evidence-based guidelines for clinical conditions, reviewed annually by a multidisciplinary expert panel.
• Guideline development involves extensive analysis of peer-reviewed literature and the application of methodologies like RAND/UCLA Appropriateness Method and GRADE.
• Expert opinion supplements evidence when data is lacking or equivocal to recommend imaging or treatment procedures.

Implementation:

• Surgical treatment is the definitive approach for colon cancer.
• An organ-sparing approach may be considered for select rectal cancer patients, informed by preoperative and post-neoadjuvant treatment imaging.
• Imaging modalities are selected based on established criteria to optimize diagnostic accuracy and treatment planning.

Implications:

• Accurate preoperative imaging enhances the precision of staging for both colon and rectal cancers.
• Imaging findings directly influence the choice between surgical resection and organ-sparing strategies, particularly in rectal cancer.
• Adherence to evidence-based guidelines ensures appropriate utilization of imaging and treatment procedures, improving patient care and outcomes.