Although the sigmoid is the most common site, these outpouchings may occur throughout the colon and are seen as 2 to 5 mm openings. Obstruction of these openings may result in diverticulitis while ulceration at the dome of a diverticulum may erode into a vessel and result in diverticular bleeding. A larger angiodysplasia and multiple small angiodysplasias are interconnected in these views. These lesions can be located anywhere in the GI tract but are typically in the right colon and cecum. This entity, along with diverticulosis, represents the most common cause for massive lower GI bleeding in the elderly.
Definitive treatment involves resection of the portion of colon bearing the angiodysplasia.
This patient developed Clostridium difficile overgrowth leading to severe pseudomembranous colitis after clindamycin therapy. Raised, strongly adherent, yellow plaques are characteristic features. Almost every antibiotic has been implicated in this disease. The most common culprit currently is the cephalosporin group of antibiotics. The treatment is Vancomycin or Flagyl.