High intensity focused ultrasound or HIFU is a new type of cancer treatment. The treatment is given using a machine that gives off high frequency sound waves. These waves deliver a strong beam to a specific part of a cancer. Some cells die when this high intensity ultrasound beam is focused directly onto them. Doctors have been interested in this type of treatment for nearly 50 years. But it is only in the past few years that they have been seriously investigating its use in treating different types of cancer. One advantage of this type of treatment is that because it only uses sound waves to kill the cancer cells, it doesn’t have as many side effects as other types of cancer treatments already in use. Doctors hope to use HIFU to kill cancer cells without damaging healthy cells.