Table 1.

Colonic findings at CTC. C1 (normal, benign lesion, or 1 to 2 polyps of ≤5 mm), C2 (1 to 2 polyps, 6 to 9 mm), C3 (C3a = 3 to 4 polyps, 1 to 9 mm; C3b = 1 to 2 polyps, at least one polyp ≥10 mm; C3c = indeterminate stricture), C4 (C4a = 5 or more polyps, smaller than 10 mm; C4b = 3 or more polyps, at least one ≥10 mm) or C5 (C5a = colonic mass characteristic of malignancy; C5b = no tumour additional to colonoscopy findings; Cx = inadequate study)

Colonic Findings	Number of Scans	Percentage
C1	160	71.4%
C2	19	8.5%
C3a	7	3.1%
C3b	10	4.5%
C3c	1	0.45%
C4a	3	1.3%
C4b	4	1.8%
C5a	10	4.5%
C5b	1	0.45%
Cx	9	4%