Biliary obstruction: A blockage in the bile duct system that prevents bile from flowing from the liver to the intestine. Endoscopic ultrasound (EUS): A minimally invasive procedure that uses high ...

Bile duct obstruction: A blockage in the gallbladder ducts could cause symptoms that lead to having an ultrasound. The blockage could be due to gallstones. Less commonly, a tumor or a polyp could ...