Radiation enteritis

Type of intestinal ischemia
Damage to vascular endothelial cells
Results in endarteritis obliterans
Distal ileum and pelvic loops commonly involved
Time interval between radiation and symptoms variable
Colicky abdominal pain, diarrhea, malabsorption, intermittent small intestinal obstruction

Thickening of valvulae conniventes, mural thickening, effacement of mucosal pattern, ulceration, fixation and angulation of small intestinal loops
Distortion of mucosal folds along anti mesenteric border of intestine due to inflamed and thickened mesentery – ‘mucosal tacking’
Luminal narrowing and stenosis (single or multiple)
Sinus and fistulae rare
CT: target appearance due to submucosal edema and mucosal hyperenhancement
Homogeneous mural thickening suggests chronic healing fibrotic phase