A scan can be used to diagnose possible appendicitis and kidney stones if the ultrasound results are unclear. The problem: Some doctors recommend CT colonography, or "virtual colonoscopy," over ...

Unsuspected extracolonic findings at screening CT colonography: clinical and economic impact. Radiology 249 , 151–159 (2008). Article Google Scholar ...

CT colonography takes about 15 minutes. At the beginning of the procedure, the colon is filled with carbon dioxide or air with a tube introduced into the rectum. The patient is asked to roll over into ...

Overall, the incidence of colorectal cancer has decreased over the decades, largely in part due to the use of screening modalities, such as colonoscopy.