Diagnostic Accuracy of Size-Based Preoperative CT Assessment for Predicting Lymph Node Metastasis in Colon Cancer: A Systematic Review and Meta-Analysis
In brief
Pre-op CT detects roughly 70% of colon cancer nodal metastases
A meta-analysis of 29 studies (5634 patients) found that CT using size criteria alone identified about 69% of lymph-node metastases and correctly ruled out disease in about 66% of cases. The moderate accuracy suggests size-based CT alone is not reliable for definitive staging, highlighting a need for additional imaging or diagnostic tools.
- Journal
- Annals of gastroenterological surgery (Q1)
- Published
- 24 March 2026
- Study design
- Systematic review of cohort studies
- Evidence level
- Level 2, Moderate (CEBM 2a)
- Authors
- Yuji Takayama, Tomoya Shimizu, Jun Watanabe, Shimpei Ogawa, Yukihide Kanemitsu
- PMID
- 42495671
- DOI
- 10.1002/ags3.70218
Why clinicians should know about it
- Picked for Gastroenterology (top studies of the week, 26 July 2026): CT size criteria show moderate accuracy for nodal metastasis
- Picked for Pathology and Forensic Medicine (top studies of the week, 26 July 2026).
- Picked for Oncology and Radiation Oncology (top studies of the week, 26 July 2026): CT size criteria diagnostic accuracy for lymph node metastasis
- Picked for Surgery (top studies of the week, 26 July 2026).
- Picked for Radiology, Radiation Oncology, Nuclear Medicine, Medical Physics and Imaging (top studies of the week, 26 July 2026).
Abstract
BACKGROUND: Accurate identification of preoperative lymph node metastasis is essential for planning colon cancer treatment. Computed tomography (CT) is widely used for staging, but its diagnostic performance based on size criteria alone remains unclear. This study aimed to evaluate the diagnostic accuracy of preoperative CT for detecting lymph node metastasis in colon cancer. METHODS: A systematic search of MEDLINE, Embase, and the Cochrane Central Register of Controlled Trials was conducted on June 12, 2025. Studies comparing preoperative CT with pathological evaluation and providing 2 × 2 contingency tables were included. Pooled sensitivity and specificity were calculated using a hierarchical summary receiver operating characteristic model and a bivariate random-effects model. Subgroup analyses were performed according to cancer location (colon only vs. colon plus rectal cancer) and diagnostic criteria (size alone vs. size plus morphology). Study quality was assessed using QUADAS-2. RESULTS: Twenty-nine studies involving 5634 patients were included. The pooled sensitivity and specificity of CT for detecting lymph node metastasis were 0.693 (95% CI: 0.636-0.744) and 0.660 (95% CI: 0.581-0.731), respectively, with an area under the curve of 0.727. Meta-regression showed no statistically significant differences in diagnostic performance between colon-only studies and those including rectal cancer (p = 0.561 and 0.316), or between size-only and morphologic criteria (p = 0.822 and 0.536). CONCLUSIONS: CT using size criteria alone for preoperative lymph node staging in colon cancer demonstrated only moderate diagnostic performance. These findings indicate that relying on lymph node size as the primary determinant may be insufficient for reliable clinical decision-making.
Abstract as published, via PubMed.
For healthcare professionals. The summary is generated by AI from the published abstract, and the evidence level is assigned automatically from the study design on the Oxford CEBM hierarchy. Neither is medical advice. Read the full paper before changing practice.