Most patients with<unk>  recover fully, although the prognosis depends on the severity of the<unk> . Patients with pre-existing peripheral vascular disease or<unk>  of the ascending (right) colon may be at increased risk for complications or death. Non-gangrenous<unk> , which comprises the vast majority of cases, is associated with a mortality rate of approximately 6%. However, the minority of patients who develop gangrene as a result of colonic<unk>  have a mortality rate of 50–75% with surgical treatment; the mortality rate is almost 100% without surgical intervention. Long-term complications About 20% of patients with acute<unk>  may develop a long-term complication known as chronic<unk> . Symptoms can include recurrent infections, bloody diarrhea, weight loss, and chronic abdominal pain. Chronic<unk>  is often treated with surgical removal of the chronically diseased portion of the bowel. A colonic stricture is a band of scar tissue which forms as a result of the<unk>  injury and narrows the lumen of the colon. Strictures are often treated observantly; they may heal spontaneously over 12–24 months. If a bowel obstruction develops as a result of the stricture, surgical resection is the usual treatment, although endoscopic dilatation and stenting have also been employed.
Ischemic colitis
Ulcerative colitis
Diversion colitis
Chemical colitis
Collagenous colitis
Cytomegalovirus colitis
Microscopic colitis
Diverticulitis