There are various types of cysts and tumours in the liver, all of which are abnormal growths or structures.

A cyst is an abnormal, fluid-filled balloon or bubblelike structure (sac) that can grow in any part of your body. Liver cysts are mostly congenital, meaning that you have them from birth, or caused by contact with some form of parasite.

A solid tumour is an abnormal lump or swelling of tissue caused by an uncontrolled build-up of cells.

Tumours can be benign or malignant – those that are benign do not spread or cause cancer, while malignant tumours are cancerous and may invade other parts of the body.

Most of the information is focused on cysts and how they can affect the liver and bile ducts. Bile ducts are tube-shaped structures that carry bile from the liver to the gallbladder and then to the small intestine for removal (excretion) from the body.

This publication provides brief information on the most common benign tumours, specifically haemangiomas, focal nodular hyperplasia and adenomas. Cystic diseases, unlike benign tumours, can pose a serious health risk but are relatively rare in the UK.