Ischemic colitis associated with hypertension.

A 48-year-old man with accelerated hypertension developed right-sided ischemic colitis. There was no evidence of another cause of vascular inadequacy. Microscopically, the bowel showed ischemic alterations of different stages. The arterial alterations of different stages. The arterial vessels showed minimal changes. In older lesions, fibrosis was prominent and the mucosa was atrophic. In more recent lesions, some vessels of the submucosa were plugged with fibrin and the overlying mucosa was infiltrated by nonorganized hemorrhage and cellular elements.