Cocaine induced sphincter of Oddi dysfunction


The patient had a history of hepatitis C, but he was not a chronic alcoholic nor did he use opioids. He had no evidence of chronic pancreatitis. A routine ultrasound showed a common bile duct (CBD) dilated up to 0.8 cm. Due to the US, MRCP was ordered. There was no evidence of elevated bilirubin and alkaline phosphatase.

Nuclear medicine biliary scan was recommended but he has not kept his follow up for this study. This would have been a non-invasive confirmatory step.

Since the patient used cocaine and there was no mass on MRI/MRCP it was felt his dilated CBD was due to cocaine-induced sphincter of Oddi dysfunction.

These days radiologists need to know non-malignant etiologies for CBD dilation.