<prompt> Following is least common about angiodysplasia of colon:Involvement of cecumInvolvement of rectum in 50 of casesAffecting age group 40 yearsCause of troublesome lower GI hemorrhage  <response>: Ans. b Involvement of rectum in 50 cases Angiodysplasia is rare in rectum Causes troublesome intermittent lower GI bleeding. Very difficult to diagnose 