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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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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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