For the following points: (A), prospective controlled trials; (B), observational studies; (C), expert opinion. • Patients with constipation should undergo colonoscopy if they have rectal bleeding, heme-positive stool, iron deficiency anemia, weight loss, obstructive symptoms, recent onset of constipation, rectal prolapse, or change in stool caliber (C). • Chronic constipation may be a risk factor for colorectal cancer (B). For this reason, patients complaining of constipation who are over the age of 50 years and who have not previously had colon cancer screening should have a colonoscopy (C). • In younger patients flexible sigmoidoscopy may be adequate (C). • Colonoscopy allows dilation of benign colonic strictures in some patients (B).
ASJC Scopus subject areas
- Radiology Nuclear Medicine and imaging