Computed tomographic colonography (CTC); colorectal cancer diagnosis with CTC in an Auckland population.
AIM
To determine the sensitivity of computed tomographic colonography (CTC) in the detection of colorectal cancer in our population and evaluate the reasons why these lesions may be missed on CTC.


METHODS
All patients who underwent CTC in the 65-month period from 1 January 2004 to 1 July 2009 were included in the analysis. Demographic data and CTC findings were recorded, according to the CT Colonography Reporting and Data System. Data were cross-matched with the National Cancer Registry results for colorectal cancer cases between 1 January 2004 and 1 October 2009, 3 months longer to include any delayed diagnoses.


RESULTS
There were 2026 consecutive CTC patients, comprising 52.6% female, average age of 60 years; range 19-87. Approximately 84% were symptomatic. There were 45 confirmed colorectal cancers among this patient group in the National Cancer Registry during the relevant time period compared with 43 suspected cancers on CTC, giving a miss rate of 2 of 45, or 4.4%.


CONCLUSION
The sensitivity of 95% for CTC in the detection of colorectal cancer compares favourably with the published national and international data.
['Moore|Helen|H|', 'Dodd|Nicholas|N|']
D000328:Adult D000368:Aged D000369:Aged, 80 and over D023881:Colonography, Computed Tomographic D015179:Colorectal Neoplasms D005260:Female D006801:Humans D008297:Male D008875:Middle Aged D009520:New Zealand D015588:Observer Variation D015995:Prevalence D012042:Registries D015203:Reproducibility of Results D012307:Risk Factors D012680:Sensitivity and Specificity D055815:Young Adult
body CT gastrointestinal imaging quality assurance