## **Core Concept**
Courvoisier's law states that in a patient with a palpable gallbladder and painless jaundice, the cause is more likely to be a malignant tumor (e.g., pancreatic cancer) rather than a gallstone. This law has exceptions, particularly when the gallbladder is distended due to a condition other than a malignant tumor.

## **Why the Correct Answer is Right**
The correct answer, , refers to a condition known as **Mirizzi syndrome**. In Mirizzi syndrome, a gallstone becomes impacted in the cystic duct or the neck of the gallbladder, causing obstruction of the bile duct and subsequent jaundice. This condition can lead to a palpable, distended gallbladder (due to chronic inflammation and scarring) and jaundice, mimicking the presentation of a malignant tumor but is actually caused by a benign gallstone. Therefore, Mirizzi syndrome represents an exception to Courvoisier's law.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because it does not specify a known exception to Courvoisier's law related to gallstones or other benign conditions causing a palpable gallbladder and jaundice.
- **Option B:** Similarly, this option lacks specificity regarding a recognized exception to Courvoisier's law.
- **Option D:** This option is incorrect as it does not accurately represent a documented exception to Courvoisier's law.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that **Mirizzi syndrome** is an important exception to Courvoisier's law. Patients with Mirizzi syndrome present with obstructive jaundice and a palpable gallbladder due to a large gallstone obstructing the bile duct, not a malignancy. Recognizing this syndrome is crucial for surgical planning and patient management.

## **Correct Answer:** . Mirizzi syndrome