Answers: The mean diameter of the usual common duct be 4.1 mm. A common duct greater than 7 mm (circumfrence = 21.98 mm) within diameter can be seen within (a) nonjaundiced patients with gallstones and/or pancreatitis, or (b) jaundiced patients near common duct let by stone or tumor. A common duct greater than 11 mm (circumfrence 34.54mm) contained by diameter is strongly suggestive of obstruction by stone or tumor.
Gekko!