Welcome to Classifications and Online Calculators in Radiology

This site was build along with the Atlas of Radiology Images to support your knowledge in radiology.

You will find here:

that are used in radiology and related fields with free access.


  • Some pages are accompanied by illustrations
  • All pages contain tags for easy navigation

The concept

The concept of this website is based on a previous site that was founded in 2008 and is still up and running. The website is composed as a book, where all sources are properly referenced, according to a good practice in scientific publications.

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    Longmire classification of extrahepatic biliary system

    Longmire classification was published in 1973. It divides extrahepatic biliary system into three sections with respect to spread, surgical approach and symptoms caused by primary tumours.

    Upper third right and left hepatic duct, bifurcation, common hepatic duct
    Middle third common bile duct from the cystic duct to pancreas
    Lower third intrapancreatic part of the common bile duct


    1. Longmire WP, McArthur MS, Bastounis EA, Hiatt J. Carcinoma of the extrahepatic biliary tract. Ann Surg. 1973 Sep;178(3):333–45.

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