Morphological predictors for lymph node metastases on computed tomography in colon cancer

Area of Science:

• Radiology
• Oncology
• Pathology

Background:

• Accurate staging of colon cancer is crucial for treatment planning and prognosis.
• Lymph node metastasis (Stage III disease) is a key prognostic factor in colon cancer.
• Computed tomography (CT) is a primary imaging modality for colon cancer staging.

Purpose of the Study:

• To evaluate morphological features on computed tomography (CT) as predictors of lymph node metastases in colon cancer.
• To assess the sensitivity, specificity, and predictive values of specific CT criteria for identifying Stage III colon cancer.

Main Methods:

• Retrospective analysis of 94 patients with colon adenocarcinoma who underwent curative resection.
• Two blinded observers reviewed contrast-enhanced CT scans for tumor characteristics and lymph node morphology (internal heterogeneity, irregular outer border).
• Histopathology served as the reference standard; statistical analysis calculated diagnostic performance and inter-observer agreement.

Main Results:

• Internal lymph node heterogeneity demonstrated moderate sensitivity (66-77%) and high specificity (95%) for Stage III disease.
• Irregular outer lymph node borders showed poor sensitivity (49-54%) but high specificity (97%).
• Combined criteria (heterogeneity and/or irregular border) yielded moderate sensitivity (67-77%) and high specificity (95%), with good predictive values.

Conclusions:

• Morphological criteria on CT, particularly internal heterogeneity and irregular outer borders, are valuable for predicting lymph node metastases in colon cancer.
• These CT findings offer high specificity but moderate sensitivity for identifying Stage III colon cancer, supporting their use in clinical assessment.
• The study highlights the utility of CT-based morphological analysis in non-invasively assessing lymph node involvement in colon cancer staging.