Fatty liver is certainly possible. It will show both on an ultrasound or CT scan.
An abdominal CT scan would primarily cover the upper abdominal area. If you want to image the lower abdomen, a pelvic CT should be ordered.
The best way to look at the colon would be via a colonoscopy.
These questions should be discussed with your personal physician.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
kevinmd_