Radiology and endoscopy in the pretreatment diagnostic management of colorectal cancer.

This paper discusses the imaging methods available for the detection and diagnosis of colon cancer, concentrating on endoscopy and barium radiology. Effective utilization of these two methods may be facilitated by using flexible sigmoidoscopy to direct further investigation. There is a need for educational efforts to enhance the performance of endoscopy and barium radiology so that the high standards achieved in some published series are more generally available to patients. New developments in contrast agents will alter rapidly the roles of ultrasound, CT scanning, and magnetic resonance in the investigation and management of colorectal cancer.