Table 5.

Extracolonic findings in FOBT-positive participants

C-RADS classification*	No of participants†	Type of E4 findings‡	Additional procedures
E1	138 (42.6%)	–
E2	164 (50.6%)	–
E3	13 (4.0%)	–	Imaging: 3
E4	10 (3.1%)	Aortic aneurysm: 2	Imaging: 12
		Iliac aneurysm: 1	Operation: 2
		Extracolonic mass: 8
		Lung nodules: 2

*C-RADS classification:²² E1 normal exam or anatomical variant; E2 clinically unimportant finding (eg, liver or kidney cysts); E3 probably unimportant finding (eg, indeterminate renal lesions); E4 potentially important finding (eg, aortic aneurysm, solid mass in liver or kidney).

†Numbers represent all participants that received a CTC scan (thus also participants that refused a colonoscopy after CTC and participants with a CTC that was of insufficient quality for polyp detection)

‡All extracolonic findings found in 9 participants.

C-RADS, CTC Reporting and Data System; FOBT, faecal occult blood test.