In patients without a gallbladder, the CBD is considered dilated when the diameter exceeds:

In patients without a gallbladder, the CBD is considered dilated when the diameter exceeds:

• A. >8 mm
• B. >10 mm
• C. >11 mm
• D. >12 mm

Answer: (D)

In ultrasound assessment, the common bile duct’s size is used to look for obstruction. After the gallbladder is removed, the duct can be naturally larger, so the threshold for calling it dilated is higher. The standard cutoff in patients without a gallbladder is a diameter greater than 12 millimeters. This helps avoid overcalling normal postoperative enlargement as pathology. Values up to around 10–12 mm can be seen in older patients or after cholecystectomy, but exceeding 12 mm is the point at which dilation is considered abnormal and warrants further evaluation for possible obstruction, stones in the duct, stricture, or other biliary pathology. If there are symptoms or abnormal liver tests, additional imaging like MRCP or appropriate follow-up would be considered.

In ultrasound assessment, the common bile duct’s size is used to look for obstruction. After the gallbladder is removed, the duct can be naturally larger, so the threshold for calling it dilated is higher. The standard cutoff in patients without a gallbladder is a diameter greater than 12 millimeters. This helps avoid overcalling normal postoperative enlargement as pathology. Values up to around 10–12 mm can be seen in older patients or after cholecystectomy, but exceeding 12 mm is the point at which dilation is considered abnormal and warrants further evaluation for possible obstruction, stones in the duct, stricture, or other biliary pathology. If there are symptoms or abnormal liver tests, additional imaging like MRCP or appropriate follow-up would be considered.