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common bile duct

what does dilation of the common bile duct mean?
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what is the mean of common bile duct dilation  (9mm)?cdc
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Dilation of the common bile duct typically means a 'widening' of the duct at some point. It expands in size due to possible blockage by a stone, widens due to a spasm downstream that results in a back-up of bile and pancreatic fluids, or it may expand due to another form of disease state. Some people experience a dilation/wideing of the CBD in the years following removal of the gallbladder although the reason this happens is unknown at the current time.
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