In choledocholithiasis, what is the significance of the common bile duct being dilated to more than 6mm?

In a case of choledocholithiasis, the dilation of the common bile duct (CBD) to more than 6mm is significant because it suggests an obstruction in the biliary system due to the presence of gallstones. The dilation implies that bile is unable to flow properly from the liver to the intestine, potentially leading to significant complications.

When the CBD is dilated, there is an increased likelihood that the obstruction is serious enough to warrant surgical intervention. This situation often necessitates procedures such as endoscopic retrograde cholangiopancreatography (ERCP) to remove the obstructing gallstones or even surgical exploration if there are complications. The risk of acute cholangitis and pancreatitis increases with any delay in addressing the obstruction, emphasizing the importance of recognizing CBD dilation as a signal for timely intervention.

Other options may touch on related aspects of the condition, such as liver dysfunction or the risk of pancreatitis, but the immediate and critical response to a dilated CBD is the need for intervention to prevent these complications and ensure the bile can flow normally again.