Abstract
[Purpose]
The usefulness of CT colonography (CTC) immediately after the trial of colonoscopy was investigated in cases with incomplete total colonoscopy (TCS) or failure to insert the endoscope up to the cecum.
[Subjects and Methods]
Of 210 CTC cases after incomplete TCS, 24 cases with 28 lesions that were examined by successful TCS follow-up within one year were analyzed for the diagnostic accuracy of CTC after informed consent was obtained. The results of the follow-up TCS were employed as the gold standard.
[Results]
The follow-up TCS detected lesions in 16 of 24 cases. Of these, 10 cases had lesions 5 mm or larger that were considered clinically significant. As far as lesions 5 mm or larger were concerned, per-lesion sensitivity and the positive predictive value (PPV) were as high as 93.3% and 93.3%, respectively, and per-patient sensitivity, specificity and PPV were as high as 90.0%, 92.9% and 90.0%, respectively.
[Conclusion]
CTC is thought to be a highly accurate and useful diagnostic modality for examining the whole large bowel in cases with incomplete TCS.
