<prompt> Massive colonic bleeding in a patient of Di veiculosis is from -Inferior mesenteric aerySuperior mesentric aeryCoeliac aeryGastro-duodenal aery  <response>: Ans. is b i.e., Superior Mesentric Aery Although diveiculosis involves mainly the left side of colon, bleeding occurs mostly from right side of colon. Right side is supplied by superior mesentric aery. Hemorrhage from a colonic diveicula is the most common cause of hematochezia in patients over the age of 60. - Harrison 16e, p 1796 