Severity of Common Bile Duct Stones (CBDS)

Clinical Significance and Natural History

CBDS occur in approximately 10-20% of patients with symptomatic gallstones, with most originating in the gallbladder and migrating into the bile duct (secondary CBDS) 1
The GallRiks study demonstrated that 25.3% of patients with untreated CBDS experienced unfavorable outcomes (defined as pancreatitis, cholangitis, bile duct obstruction, or subsequent symptoms) compared to only 12.7% of patients who underwent stone extraction 2, 3
Even small stones (<4mm) can cause significant problems, with 15.9% of conservatively managed patients experiencing complications versus 8.9% of those who had stone extraction 2

Partial or complete biliary obstruction leading to obstructive jaundice 1, 2
Acute cholangitis (infection of the bile duct), which can progress to sepsis 2
Hepatic abscesses (collections of pus in the liver) 2
Acute pancreatitis (gallstones are estimated to cause up to 50% of acute pancreatitis cases) 3
Secondary biliary cirrhosis (long-term liver damage from chronic bile duct obstruction) 2

Epigastric or right upper quadrant pain, especially if associated with jaundice and/or fever 3, 4
Jaundice (yellowing of skin and eyes) due to obstruction of bile flow 2
Fever and chills, indicating possible cholangitis 3
Some patients may present with acute pancreatitis 3

Initial evaluation with trans-abdominal ultrasound and liver function tests is recommended for suspected CBDS 4, 5
Normal results do not rule out CBDS if clinical suspicion remains high 4, 5
For intermediate probability cases, more advanced imaging with magnetic resonance cholangiopancreatography (MRCP) or endoscopic ultrasound (EUS) is recommended 4

Current guidelines strongly recommend stone extraction for patients diagnosed with CBDS, especially those who are symptomatic 1, 5
The evidence from the GallRiks study shows significantly better outcomes with active treatment (stone extraction) compared to conservative management 2, 3

CBDS can be present even with normal liver function tests and ultrasound findings 4
Not all patients with CBDS present with classic symptoms; a high index of suspicion is needed 3
Delaying treatment of symptomatic CBDS can lead to serious and potentially fatal complications 2
There are no controlled studies examining the natural history of incidentally found CBDS in asymptomatic patients, but expert opinion favors stone extraction in these cases as well 2