In Bouveret syndrome, gall stone is impacted in:
**Core Concept**
Bouveret syndrome is a rare complication of gallstones where a large gallstone becomes impacted in the duodenum, often at the ampulla of Vater, causing obstructive jaundice and other symptoms.
**Why the Correct Answer is Right**
The impacted gallstone is usually large and has a diameter of more than 3 cm, which allows it to pass through the cystic duct and into the common bile duct, eventually becoming lodged in the duodenum. In Bouveret syndrome, the stone typically becomes impacted at the ampulla of Vater, where the bile and pancreatic ducts enter the duodenum. This causes a complete obstruction of the bile duct, leading to jaundice and other complications.
**Why Each Wrong Option is Incorrect**
**Option A:** The gallbladder is the correct location where the stone forms, but it's not where the stone is impacted in Bouveret syndrome.
**Option B:** The common bile duct is a possible location for a gallstone to become impacted, but it's not the characteristic location for Bouveret syndrome.
**Option C:** The pancreatic duct is not a typical location for a gallstone to become impacted in Bouveret syndrome.
**Clinical Pearl / High-Yield Fact**
Bouveret syndrome is a classic example of a gallstone ileus, where a gallstone becomes lodged in the small intestine, causing obstruction. The ampulla of Vater is a critical anatomical structure where the bile and pancreatic ducts enter the duodenum, making it a high-risk area for gallstone impaction.
**Correct Answer:** C.