The treatment of choice for an 8 mm retained common bile duct (CBD) stone is:
**Core Concept**
Endoscopic retrograde cholangiopancreatography (ERCP) with sphincterotomy is a minimally invasive procedure used to remove bile duct stones. The procedure involves the insertion of a flexible tube with a camera and a cutting tool into the mouth and guided through the stomach and small intestine to reach the bile ducts.
**Why the Correct Answer is Right**
ERCP with sphincterotomy is the preferred treatment for retained CBD stones because it allows for direct visualization of the bile ducts and precise removal of the stone. The sphincterotomy procedure involves cutting the muscle at the ampulla of Vater, allowing for the passage of a balloon or basket to capture and remove the stone. This approach is particularly effective for stones larger than 5 mm, such as the 8 mm stone in question.
**Why Each Wrong Option is Incorrect**
**Option A:** Laparoscopic cholecystectomy is a surgical procedure for removing the gallbladder, but it is not the preferred treatment for retained CBD stones. While it may be performed in conjunction with CBD stone removal, it is not the primary treatment for this condition.
**Option B:** Conservative management with observation and medical therapy is not suitable for retained CBD stones, as it does not address the underlying cause of the obstruction and may lead to complications such as cholangitis.
**Option C:** Percutaneous transhepatic cholangiography (PTC) is a procedure used to diagnose and treat bile duct disorders, but it is not the preferred treatment for retained CBD stones due to its potential risks and complications.
**Clinical Pearl / High-Yield Fact**
ERCP with sphincterotomy is a highly effective treatment for retained CBD stones, but it is not without risks. Complications such as pancreatitis, bleeding, and cholangitis can occur, making it essential for patients to be closely monitored during and after the procedure.
**Correct Answer:** C. ERCP with sphincterotomy.