Bowel wall thickening.

Pseudo membranous Colitis with dilatation of the sigmoid
The diagnosis is made by testing for the presence of C. difficile 
 toxins in the stool or the presence of C. difficile itself.

Here a patient with extensive pneumatosis and gas within the portal veins.
Bowel ischemia was found at surgery.

Patency of the mesenteric vesselsThe causes of bowel ischemia are arterial occlusion, venous thrombosis, strangulation and a low flow state.

The image shows a large segment of ileum with poor enhancement.
In the mesentery there is edema and venous engorgement.
These findings indicate ischemia.
Notice the thrombus within the superior mesenteric vein.

bowel mesenteric fistula.

Mesenteric edema.

Mesenteric edema

Small bowel feces sign
The yellow arrow indicates a small bowel feces sign in a patient with a small bowel obstruction.

Here a patient high density bowel content indicating gastro-intestinal hemorrhage.

Fatty bowel content in a patient with celiac disease.

Reference