What is the term for an extrahepatic mass that compresses the common bile duct?

The term for an extrahepatic mass that compresses the common bile duct is known as Courvoisier's Gallbladder. This phenomenon occurs when the common bile duct is obstructed, often by a mass in the head of the pancreas or a gallstone, leading to the dilation of the gallbladder. When a patient has painless jaundice associated with a palpable gallbladder, it suggests that there is a blockage preventing bile from flowing from the liver to the duodenum, resulting in the accumulation of bile in the gallbladder.

In contrast, Mirizzi Syndrome specifically involves the obstruction of the common hepatic duct caused by a gallstone in the cystic duct or gallbladder neck, leading to a particular set of complications. Cholecystitis refers to inflammation of the gallbladder, typically due to obstruction from gallstones, but does not specifically highlight the compressive aspect on the common bile duct. A biliary stricture pertains to a narrowing of the bile duct, which can also cause obstruction, but it does not fit the description of an extrahepatic mass causing pressure on the common bile duct as Courvoisier's Gallbladder does.