Table 2. Explanation of the different C-RADS categories (15,16).

Category	Findings
C-RADS E1	Normal examination results or anatomical variants
C-RADS E2	Clinically unimportant findings
	No further evaluation or investigation indicated (e.g., renal cyst, diverticulosis)
C-RADS E3	Indeterminate, incompletely characterized, but probably benign
	Further clinical correlation and investigation could be carried out if indicated (e.g., minimally complex renal cyst)
C-RADS E4	Potentially important findings
	Further investigation required and communication to the referring physician, as per accepted practice guidelines (e.g., solid renal mass, abdominal aortic aneurysm)

C-RADS, CT Colonography Reporting and Data System; CT, computed tomography.