Tumor. A tumor could retain bile from draining out with the gallbladder as it should really. This causes bile buildup that can result in cholecystitis. Veins have blood again to the guts once the oxygen is eradicated. In the event the vein is blocked, blood backs up during the intestines, https://www.sgvascularctr.com/treatments-for-gangrene-insights-from-a-vascular-surgeon/