TABLE 1.
Features of Colorectal Lesions Reviewed During Initial Day of Training
| Case No. | Interpretive Techniques Used to Examine Each Set of CTC Cases | Teaching Point | No. of Cases |
|---|---|---|---|
| 1–10 (Cancers, partial casesa) | 2D or 3D search, prone or supine, internal attenuation | ||
| Annular cancer | 5 | ||
| Flat cancer or carpet lesion | 4 | ||
| Large polypoid | 1 | ||
| Shouldering | 4 | ||
| Luminal constriction | 4 | ||
| Position of large lesions can change because of gravity | 2 | ||
| 11–27 (Polyps, partial casesa) | 2D or 3D search, prone or supine, internal attenuation | ||
| Sessile | 9 | ||
| Pedunculated | 2 | ||
| Flat | 5 | ||
| Lipoma | 1 | ||
| Long stalk | 2 | ||
| Diminutive polyps | 3 | ||
| On folds | 5 | ||
| Rotation of colonic flexures with changes in position | 3 | ||
| Position of large lesions can change because of gravity | 3 | ||
| Irregular surface | 2 | ||
| Submerged lesions (with tagging) | 1 | ||
| One view only | 5 | ||
| 28–42 (Full casesb) | 2D or 3D search, prone or supine, internal attenuation, 3D endoluminal fly-through and 2D search methods | ||
| Polypoid cancer | 2 | ||
| Annular cancer | 1 | ||
| Flat cancer | 1 | ||
| Hemorrhoids | 1 | ||
| Sessile polyps | 14 | ||
| Pedunculated polyps | 3 | ||
| Flat polyps | 2 | ||
| Diminutive polyps | 5 | ||
| On folds | 4 | ||
| Long stalk | 1 | ||
| Irregular surface | 1 | ||
| One view only | 3 | ||
| Submerged | 3 | ||
| Lipoma | 1 | ||
| Postoperative anastomoses | 3 | ||
Note—CTC = CT colonography.
a
Radiologists were told in which segments lesions were located. Primary 2D or 3D review of entire case not performed.
b
Three negative cases and 12 with polyps or cancers.