Large Bowel

Classic “apple core” malignant lesion in transverse colon. [Courtesy of Dr. G. Olscamp]

Colon Cancer – Napkin ring sign
The differential diagnosis for the “napkin ring” sign as presented above includes: 1) TB of colon, 2) carcinoma of colon, 3) metastasis, 4) diverticular stricture, 5) endometriosis, 6) ischemic stricture, 7) lymphoma

Acute Appendicitis
Abdominal axial CT image showing dilatation of the appendix (arrow). [Courtesy of Dr. N. Jaffer]

Abdominal axial CT images showing an abscess (arrow) adjacent to the sigmoid colon (left image) and thickened sigmoid colon wall. [Courtesy of Dr. N. Jaffer]