title: Intracranial aneurysm formation after radiotherapy for medulloblastoma.
abstract: BACKGROUND
  The development of an intracranial aneurysm after radiotherapy is rare but secondary effect of cranial irradiation in a primary disease treatment.
  
  
  METHODS
  The patient was a 17-year-old male adolescent who was diagnosed as having a posterior fossa medulloblastoma when he was 8 years old. He had undergone tumor resection with radiotherapy and chemotherapy. A distal posterior inferior cerebellar artery aneurysm was identified by magnetic resonance imaging 8 years after radiotherapy and grew rapidly throughout the next 1 year. The patient underwent microsurgical clipping and was discharged without deficit.
  
  
  CONCLUSIONS
  This experience demonstrates that physicians caring for patients who have undergone intracranial radiotherapy should carefully consider the possibility of an aneurysmal formation when conducting follow-up imaging.
authors.affiliation: Department of Neurosurgery, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Ishikawa, Japan.
authors.forename: Tomoya
authors.initials: T
authors.lastname: Kamide
authors.affiliation: Department of Neurosurgery, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Ishikawa, Japan.
authors.forename: Masanao
authors.initials: M
authors.lastname: Mohri
authors.affiliation: Department of Neurosurgery, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Ishikawa, Japan.
authors.forename: Kouichi
authors.initials: K
authors.lastname: Misaki
authors.affiliation: Department of Neurosurgery, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Ishikawa, Japan.
authors.forename: Naoyuki
authors.initials: N
authors.lastname: Uchiyama
authors.affiliation: Department of Neurosurgery, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Ishikawa, Japan.
authors.forename: Mitsutoshi
authors.initials: M
authors.lastname: Nakada
keywords: Chemotherapy; intracerebral aneurysm; medulloblastoma; radiation induced