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Choledocholith – Stone in the Common Bile Duct

A choledocholith is a gallstone located in the common bile duct. It can block bile flow and lead to serious complications such as jaundice or infection.

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Things worth knowing about "Choledocholith"

A choledocholith is a gallstone located in the common bile duct. It can block bile flow and lead to serious complications such as jaundice or infection.

What is a Choledocholith?

A choledocholith is a gallstone found in the common bile duct (ductus choledochus), the tube that carries bile from the liver and gallbladder to the small intestine. When a stone becomes lodged in this duct, it can obstruct the flow of bile and cause a range of symptoms and complications. The term comes from the Greek words choledochos (bile duct) and lithos (stone). The presence of one or more stones in the common bile duct is medically referred to as choledocholithiasis.

Causes

Choledocholiths develop through two main mechanisms:

Secondary stones: The most common type. Stones form in the gallbladder and migrate into the common bile duct.
Primary stones: Stones that form directly within the bile duct itself, typically composed of calcium bilirubinate (pigment stones).

Key risk factors include:

Pre-existing gallstones (cholelithiasis)
Inflammation of the gallbladder (cholecystitis)
Bile duct disorders such as primary sclerosing cholangitis
Parasitic infections in certain regions (e.g., Ascaris lumbricoides)
Advanced age

Symptoms

Choledocholiths may be asymptomatic or cause the following symptoms:

Biliary colic: Severe, cramping pain in the upper right abdomen, often triggered by fatty meals
Jaundice (icterus): Yellowing of the skin and eyes due to bile buildup
Dark urine and pale stools caused by blocked bile flow
Itching (pruritus) due to bile salt deposits in the skin
Fever and chills in the case of bacterial infection (cholangitis)
Nausea and vomiting

The simultaneous occurrence of fever, jaundice, and upper abdominal pain is known as Charcot's triad and is a classic sign of acute cholangitis.

Diagnosis

Diagnosis typically involves a combination of laboratory and imaging investigations:

Blood tests: Elevated liver enzymes (bilirubin, alkaline phosphatase, GGT), inflammatory markers (CRP, white blood cell count)
Abdominal ultrasound: First-line imaging to detect dilated bile ducts
Magnetic resonance cholangiopancreatography (MRCP): Non-invasive imaging technique providing detailed visualization of the bile ducts
Endoscopic ultrasound (EUS): High-resolution ultrasound using an endoscope, particularly useful for small stones
Endoscopic retrograde cholangiopancreatography (ERCP): Used for both diagnosis and treatment simultaneously

Treatment

The goal of treatment is to remove the stone and relieve the obstruction of the bile duct.

Endoscopic Treatment

ERCP (endoscopic retrograde cholangiopancreatography) is the standard treatment approach. An endoscope is passed through the mouth, stomach, and into the small intestine. The opening of the bile duct (papilla of Vater) is then widened through a procedure called sphincterotomy, and the stone is extracted using a basket or balloon catheter.

Lithotripsy

For very large stones, mechanical or electrohydraulic lithotripsy (stone fragmentation) may be used prior to endoscopic extraction.

Surgical Treatment

If endoscopic treatment is unsuccessful, or if the gallbladder also needs to be removed, laparoscopic or open surgery may be performed.

Management of Complications

Acute cholangitis (infection of the bile duct) requires immediate antibiotic therapy and urgent bile duct decompression to prevent life-threatening sepsis. Associated pancreatitis (inflammation of the pancreas) may require intensive care management.

References

European Association for the Study of the Liver (EASL): EASL Clinical Practice Guidelines on the prevention, diagnosis and treatment of gallstones. Journal of Hepatology, 65(1), 146-181, 2016.
Williams E. et al.: Updated guideline on the management of common bile duct stones (CBDS). Gut, 66(5), 765-782, 2017.
Bray F. et al.: Choledocholithiasis - Diagnosis and Management. Surgical Clinics of North America, 94(2), 325-337, 2014.

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