Ultrasound obstruction at the lower end of this dilated CBD

image
fig. A, B, C, D, E, F , from upper
(A) Duodenal gas obscures the cause of obstruction at the lower end of this dilated CBD. (B) Patient
positioning can move bowel gas away from the duct, demonstrating the cause of obstruction—a stone at the lower
end. (C) TS of a dilated CBD in the head of the pancreas (arrow). (D) Dilated CBD with a hypoechoic ampullary
carcinoma at the lower end (arrows). (E) Intrahepatic bile duct dilatation. (F) MRCP, post-cholecystectomy, showing
stones in the CBD and cystic duct stump.
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