Gallstones can cause a dilated common bile duct when a stone moves into the duct and blocks bile flow. This condition is called choledocholithiasis. It may cause right upper abdominal pain, jaundice, dark urine, fever, nausea, vomiting, or pancreatitis and may require ERCP treatment.
Key Takeaways
- A dilated common bile duct is an imaging finding, not a final diagnosis.
- Symptoms, liver blood tests, age, gallbladder history, and imaging details decide how concerning the finding is.
- Gallstones, strictures, inflammation, pancreatitis, and less commonly tumors can block bile flow and cause duct widening.
- MRCP and EUS are commonly used for diagnosis; ERCP is usually reserved when treatment may be needed.
How gallstones cause CBD dilation
Gallstones usually form in the gallbladder, but they can move into the common bile duct. When a stone blocks bile drainage, pressure builds behind the blockage and the duct can widen. This is one of the most common clinically important reasons for CBD dilation.
Symptoms of a blocked duct
Symptoms may include right upper abdominal pain, pain after fatty meals, nausea, vomiting, yellow eyes or skin, dark urine, pale stools, itching, fever, or chills. If the pancreas is irritated, pancreatitis can cause severe upper abdominal pain that may radiate to the back.
Why fever and jaundice matter
Fever with jaundice and abdominal pain can suggest cholangitis, a potentially serious infection related to blocked bile flow. This situation requires urgent medical attention.
How stones are diagnosed
Ultrasound may show gallstones and duct dilation, but it may miss small stones in the duct. MRCP can map the bile ducts. EUS can detect small stones with high detail. ERCP can remove stones when treatment is needed.
Treatment approach
When a common bile duct stone is causing obstruction, ERCP is commonly used to open the duct and remove the stone. If the gallbladder is still present, doctors may also discuss gallbladder surgery to reduce future stone problems.
Patient takeaway
CBD dilation plus gallstones is more than a measurement issue. It is about whether bile is blocked. Symptoms and labs help decide how urgent the evaluation should be.
