%0 Journal Article %T Glioblastoma Multiforme in the Posterior Cranial Fossa in a Patient with Neurofibromatosis Type I %A Marike L. D. Broekman %A Roelof Risselada %A JooYeon Engelen-Lee %A Wim G. M. Spliet %A Bon H. Verweij %J Case Reports in Medicine %D 2009 %I Hindawi Publishing Corporation %R 10.1155/2009/757898 %X Patients with Neurofibromatosis type 1 (NF1) have an increased risk of developing neoplasms. The most common brain tumors, found in 15%–20% of NF1 patients, are hypothalamic-optic gliomas, followed by brainstem and cerebellar pilocytic astrocytomas. These tumors generally have a benign nature. NF1 patients are predisposed to a 5-fold increased incidence of high-grade astrocytomas, which are usually located in supratentorial regions of the brain. We present an NF1 patient who developed a high-grade astrocytoma in the posterior fossa and discuss possible pathophysiological mechanisms. %U http://www.hindawi.com/crim/medicine/2009/757898/