Tumor. A tumor may possibly keep bile from draining out on the gallbladder mainly because it ought to. This causes bile buildup that can cause cholecystitis. Veins carry blood again to the guts following the oxygen is taken out. Once the vein is blocked, blood backs up inside the intestines, https://www.sgvascularctr.com/treatments-for-gangrene-insights-from-a-vascular-surgeon/