This is a type of X-ray, in which a dye (‘contrast medium’) is used to show up the blood supply, or the lymph system, in the liver. It may be done to provide a roadmap of the anatomy.

A special chemical that is taken up by any tumour, called Lipiodol, is also used. A series of quick X-ray pictures are taken that make up a real-time film of the movement of blood or lymph within the liver. This helps your doctors to see how your liver is working, and to pinpoint any blockages.

The test will take place in an operating theatre that has X-ray equipment. You may be given a sedative, to help you to relax. The dye is given to you through a thin tube line put into a vein, usually in the groin. The test takes up to an hour to complete. You will be able to go home soon afterwards.

Tests are carried out in the radiology department.