clinical characteristics and causes of large bowel obstruction
• Most patients are older than 50 years of age.
• Lower abdominal cramping pain is gradual in onset.
• Abdominal distention is a prominent feature.
• Dilated loops of bowel with haustra distinguish the colon from the small bowel on abdominal x-rays or CT scans.
• Causes include obstructing neoplasm, diverticulitis, hematoma (trauma or bleeding disorder), and cecal or sigmoid volvulus.