<prompt> Central dot sign is seen in-Carolis diseasePrimary sclerosing cholangitisPolycystic liver diseaseLiver hamartoma  <response>: Ans. is a i.e., Carolis diseaseCentral Dot sign Central dot sign refers to tiny dots with strong contrast enhancement of portal vein within dilated hepatic bile ducts on CT. Central dot sign is seen in: -i Carolis disease me. causeii Obstructive jaundiceiii Prebiliary cystiv Periportal lymphedema 