colonic diverticular hemorrhage

not related to diverticulitis
incidence: 3-47% of diverticulosis
location: 75% located in ascending colon (larger neck and dome of diverticula)
massive painless rectal hemmorhage
extravasation of radionuclide tracer
angiographic contrast pooling in bowel lumen
Rx:
- transcatheter infusion of vasoconstrictive agents (Pitressin)
- embolization (Gelfoam)