Large Bowel Obstruction – CT
Axial CT image of large bowel obstruction secondary to large intraluminal sigmoid mass. [Courtesy of Dr. N. Jaffer]
Large Bowel Obstruction
Dilated loop of colon (>6 cm) with visible haustra. [Courtesy of Dr. N. Jaffer]
Ischemia
Ischemia – Thumb-printing sign
The above images demonstrate the “thumb-printing” sign typical of colonic ischemia. It is most notable in the transverse colon on the left image, and the transverse and descending colon on the right image. [Courtesy of Dr. N. Jaffer]
Diverticular Disease
Mucosal and submucosal herniations through muscular layer of bowel. [Courtesy of Dr. G. Olscamp]
Colon Carcinoma
Classic “apple core” malignant lesion in transverse colon. [Courtesy of Dr. G. Olscamp]
Colon Cancer
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
Appendicitis
Acute Appendicitis
Abdominal axial CT image showing dilatation of the appendix (arrow). [Courtesy of Dr. N. Jaffer]
Acute Diverticulitis
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]
Polycystic Liver
Abdominal axial CT scan showing numerous cysts within the liver parenchyma. [Courtesy of Dr. N. Jaffer]
Liver US
The US is of a liver. The hypoechoic areas represent the biliary system, whereas the hyperechoic regions are suggestive of steatohepatosis (fatty liver). The sharply delineated hyperechoic margin of the liver represents the diaphragm. [Courtesy of Dr. N. Jaffer]
