PMC6202579_01
(
a
,
b
, and
c
) Ultrasound images showing a well-defined gall bladder (thin yellow arrow), dilated common bile duct (CBD; thick yellow arrow), an echogenic calculus in lower CBD (white arrow).
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Gall bladder (GB) was normal in size with well-defined walls ( Fig. 1 ). 
MRI images of a 3-month-old infant with cholestatic jaundice. (
a
,
b
) 2D MRCP showing cystic dilatation of common hepatic duct (thick yellow arrow), and gall bladder (thin yellow arrow). (
c
,
d
) Axial 3D MRCP and axial T1-weighted MR images depicting course and drainage of cystic duct (red arrow) unusually distally and continuing as CBD which shows a T2 hypointense (
c
), T1 hyperintense (
d
) calculus (white arrow) within it respectively. 2D, two dimensional; 3D, three dimensional; CBD, common bile duct; MRCP, Magnetic resonance cholangiopancreatography; MRI, magnetic resonance imaging.
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CBD extending into intrapancreatic part of CBD. Cystic duct was draining just above the calculus ( Figs. 2 and 3 ).
(
a
) 2D MRCP showing blind ending dilated common hepatic duct. Line diagram (
b
) depicting the final preoperative diagnosis of infantile choledochal cyst associated with atresia of common hepatic duct distally resulting in dilated common hepatic duct proximally (thick yellow arrow), normal size of GB (thin yellow arrow), cystic duct insertion in lower part (red arrow) and a calculus in lower CBD (blue arrow), as correlated with Coronal T2-weighted MRI image. CBD, common bile duct; GB, gall bladder; MRI, magnetic resonance imaging.
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CBD extending into intrapancreatic part of CBD. Cystic duct was draining just above the calculus ( Figs. 2 and 3 ).
Intraoperative image showing normal sized gall bladder, dilated common hepatic duct (cyst) and cystic duct noncommunicating with common hepatic duct.
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 Intraoperatively, hepatomegaly normal size GB, and a 3 x 2.5 cm cyst in subhepatic region were found ( Fig. 4 ).
Intraoperative image showing blind ending dilated common hepatic duct (cyst) noncommunicating with cystic duct.
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On further dissection, cyst was found to have a blind ending distally ( Fig. 5 ).