Doctors use brachytherapy to treat a number of different cancers. It might be the only type of radiotherapy you need or you might have it with external radiotherapy. Find out about the different types of brachytherapy.
A sealed radioactive material called a source is put inside the body, into or next to the cancer. Some types stay in the body for a very short time and some are permanent.
Selective internal radiation therapy (SIRT) is a type of brachytherapy used to treat tumours in the liver. This is usually for bowel cancer that has spread to the liver (liver secondaries).