Tumor. A tumor might continue to keep bile from draining out of the gallbladder since it ought to. This causes bile buildup that may result in cholecystitis. Veins carry blood back to the center once the oxygen is removed. Once the vein is blocked, blood backs up during the intestines, https://www.sgvascularctr.com/treatments-for-gangrene-insights-from-a-vascular-surgeon/