Diagnostic Performance of Non-Colonographic Routine CT for Detecting Advanced Colorectal Cancer

Area of Science:

• Radiology
• Oncology
• Gastroenterology

Background:

• Advanced colorectal cancers (CRCs) are sometimes found incidentally on routine abdominal CT scans.
• Evaluating the effectiveness of standard CT scans for advanced CRC detection is crucial.

Purpose of the Study:

• To assess the diagnostic performance of routine abdominal CT scans in detecting advanced colorectal cancers (CRCs).

Main Methods:

• Retrospective analysis of 350 patients who had routine CT scans and subsequent colonoscopy within six months.
• Two radiologists independently reviewed CT images for advanced CRC (p-T2 or deeper).
• Colonoscopy and pathology results served as the reference standard.

Main Results:

• Routine CT scans detected 45 out of 46 advanced CRCs (97.8% sensitivity) and correctly identified 292 out of 304 non-advanced cases (96.1% specificity).
• Overall accuracy was 96.3%, with excellent negative predictive value (99.7%).
• Diagnostic performance was high regardless of intravenous contrast administration.

Conclusions:

• Routine abdominal CT scans demonstrate excellent diagnostic performance for detecting advanced colorectal cancers.
• This non-invasive imaging technique is a valuable tool for identifying advanced CRCs in clinical settings.