HPB

Question 1

Periportal halo / periportal collar sign

Answer 1

Zone of low attenuation around the intrahepatic portal veins on contrast enhanced CT

Hypoechogenicity on liver US same distribution

Likely represents periportal oedema

Question 2

Type 1 Caroli

Answer 2

Simple Caroli disease

Congenital disorder of multifocal cystic dilation of segmental intrahepatic bile ducts. Classified as type V choledochal cyst.

Cystic dilation of larger intrahepatic bile ducts

Question 3

Type II Caroli

Answer 3

Caroli syndrome

Congenital disorder of multifocal cystic dilation of segmental intrahepatic bile ducts. Classified as type V choledochal cyst.

Combination of small bile duct dilatation and congenital hepatic fibrosis or cirrhosis +/- portal hypertension

Question 4

Caroli disease association

Answer 4

Medullary sponge kidney
ARPKD
(Very rarely) ADPKD