Divercular bleeding is one of the common origins in cases of hemorrhage from the lower bowel. Colonoscopy is performed to detect a bleeding source and to treat it with a clip. Sometime it is difficult to find out the source, because of natural hemostasis or poor preparation. Long time examination suffers both patients and doctors. Enhanced abdominal CT is useful to find out the point of bleeding. Technetium scintigraphy is also useful. These two typical cases demonstrate the validity of radiological diagnosis before colonoscopy, reducing patient's pain and doctor's burden.
