Typically sigmoid, though occasionally can be R sided
Etiology
Diverticulae are outpourings of colonic mucosa and subcuosa, herniating thru muscular layer at weak points where vessels penetrate the wall; perhaps exacerbated by chronic straining w/bowel movements
Diverticulosis is common, occurring in >50% over age 60; typically in sigmoid colon; less commonly ascending colon
Diverticulosis is asymptomatic unless infected (diverticulitis) or bleeds
Risk Factors
Diets low in fiber
Symptoms
Painless blood per rectum
Can be small or very large amounts
Can stop spontaneously and recur
Physical Exam Findings
Bright red blood on rectal exam, passed in toilet bowl, mixed w/stool
Bleeding source not visible on exam
Tests
Diverticulae can be visualized (and bleeding sometimes addressed) via colonoscopy