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Oral contrast adherence to polyps on CT colonography
Stacy D O'Connor1, Ronald M Summers, J Richard Choi
1Radiology Department, National Institutes of Health, Bethesda, MD and Uniformed Services University of the Health Sciences, Bethesda, MD 20892-1182, USA.
Journal of Computer Assisted Tomography
|December 21, 2005
Summary
Oral contrast agents used in CT colonography (CTC) adhere to polyp surfaces, aiding detection. This adherence is more common in villous polyps, a key finding for accurate interpretation.
Area of Science:
- Gastroenterology
- Radiology
- Medical Imaging
Background:
- Oral contrast agents enhance CT colonography (CTC) accuracy by tagging fluid and stool.
- The adherence of oral contrast to polyp surfaces is a less recognized phenomenon.
Purpose of the Study:
- To quantify the frequency of oral contrast agent adherence to polyp surfaces during CTC.
- To investigate if polyp histology influences contrast adherence.
Main Methods:
- Analysis of CT scans from 216 screening patients with 338 optical colonoscopy-proven polyps.
- Evaluation of polyp surface contrast adherence in prone and supine views.
- Statistical comparison of contrast adherence between villous and nonvillous polyps.
Main Results:
- Oral contrast adhered to the surface of 46% of polyps not in direct contact with a contrast pool.
- Polyps with villous histology demonstrated significantly higher contrast adherence (77%) compared to nonvillous polyps (43%).
- Contrast adherence patterns can be distinct from stool tagging, requiring careful interpretation.
Conclusions:
- Oral contrast agents frequently adhere to polyp surfaces, providing a potential visual cue during CTC interpretation.
- Villous polyps exhibit a greater propensity for contrast adherence than nonvillous types.
- Recognizing this surface adherence is crucial for accurate polyp detection and characterization in CTC.
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