Abstract
A-71-year old woman who had been hospitalized for hyperglycemia revealed to haveadilatation of a common bile duct on abdominal US and CT without a deffinite tumor atits lower part in February 261996. On MRI, a tumor projected to Vater's ampulla, withadiameter of 10 mm, was noticed having low signal intensity on the T1-weighted imageand iso signal intensity on the T2-weighted image. ERC demonstrated a defect 10 mm insize at the lower part of bile duct. On EUS, a papillary tumor projected to the lowercommon bile duct with I500r low echoes including multiple small echo free spaces wasdetected. The operation was performed because of being unable to rule out malignancy.Pathohistological examination of the resected specimen taken by papilloplasty revealedlymphangioma of common bide duct.
