A 22 year-old-man with acute lymphoblastic leukaemia had received prophylactic 
cranial irradiation and intrathecal chemotherapy. Eighteen years later a 
cerebellar glioblastoma multiforme was diagnosed. The authors speculate about 
the possibility that this tumor may have been radiation and/or chemotherapy 
induced. Improvement in neuroimaging techniques, in particular magnetic 
resonance imaging, has helped characterize Central Nervous System abnormalities, 
namely secondary brain tumours.