Purpose
CT colonoscopy is a rapidly spreading method for the evaluation of colonic disorders.
This diagnostic method is able to detect colorectal cancer and adenomas with 83-88% sensitivity and 91-95% specificity.
AIMS: To compare the diagnostic value of virtual endoscopy with a new autodissection program and conventional colonoscopy.
Methods and Materials
PATIENTS AND METHODS: 1125 patients with abdominal pain and a history of colorectal cancer were studied during a 7 years period (769 women,
358 men,
age 55±44 years) before conventional colonoscopy.
During the evaluation the colon was divided into 6 segments (sigmoid colon,
descending colon,
splenic flexure,
transverse colon,
hepatic flexure,
ascending colon with the cecum).
Segments seen by both method were compared.
CT colonoscopy was performed with a 64 slice multislice instrument (General Electric,
USA) with low dose values.
For the optimal distension of...
Results
Six thousand seven hundred and fourty-five colonic segments were evaluated.
Four hundred and sixty-nine pathologic findings were detected.
These included 61 tumours,
139 polyps,
43 strictures and 224 diverticula.
For the detection of colonic polyps larger than 5mm,
the sensitivity,
the specificity,
the positive and negative predictive values of virtual colonoscopy were 80.6,
97,
87,
and 97 percent respectively.
For the detection of diverticula these were 95,
96.2,
75,
and 92 percent.
All tumours and strictures were detected.
Conclusion
The evaluation of the colon by autodissection programme assisted virtual colonoscopy can be quickly performed.
In addition it was able to improve specificity and sensitivity of the method.
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