prophylactic cranial irradiationListen to pronunciation(PROH-fih-LAK-tik KRAY-nee-ul ir-RAY-dee-AY-shun)Radiation therapy to the head to reduce the risk that cancer will spread to the brain.Search NCI's Dictionary of Cancer TermsStarts withContainsBrowse:ABCDEFGHIJKLMNOPQRSTUVWXYZ#