Table 5. Polyp Location, Morphologic Features, and Diagnostic Confidence at Screening CT Colonography.
| Variable | CRC FH(+) (N=72 polyps in 156 patients) |
CRC FH(-) (N=2145 polyps in 8857 patients) |
|||
|---|---|---|---|---|---|
| Colonic Segment | N | % | N | % | p-value |
| Cecum | 7 | 9.7% | 239 | 11.1% | 0.850 |
| Ascending | 18 | 25.0% | 429 | 20.0% | 0.297 |
| Transverse | 14 | 19.4% | 324 | 15.1% | 0.317 |
| Descending | 10 | 13.9% | 178 | 8.3% | 0.126 |
| Sigmoid | 12 | 16.7% | 646 | 30.1% | 0.013 |
| Rectum | 11 | 15.3% | 329 | 15.3% | 0.999 |
| Polyp Morphology | N | % | N | % | P-value |
| Sessile | 45 | 62.5% | 1338 | 62.4% | 0.999 |
| Pedunculated | 13 | 18.1% | 346 | 16.1% | 0.627 |
| Flat* | 10 | 13.9% | 379 | 17.7% | 0.528 |
| Mass – Bulky | 2 | 2.8% | 40 | 1.9% | 0.399 |
| Mass – Carpet* | 1 | 1.4% | 20 | 0.9% | 0.147 |
| Mass – Benign Stricture | 1 | 1.4% | 11 | 0.5% | 0.328 |
| Submucosal/Extrinsic | 0 | 0.0% | 11 | 0.5% | 0.999 |
| Diagnostic Confidence | N | % | N | % | P-value |
| 3 = most confident | 51 | 70.8% | 1678 | 78.2% | 0.462 |
| 2 = somewhat confident | 18 | 25.0% | 406 | 18.9% | 0.222 |
| 1 = least confident | 3 | 4.2% | 61 | 2.8% | 0.148 |
*
See Methods for flat lesion definition