title: Posterior fossa giant tumefactive perivascular spaces: 8-year follow-up in an adolescent.
abstract: BACKGROUND
  Cystic masses in the posterior fossa are ominous appearing lesions with broad differential diagnosis. Giant tumefactive perivascular spaces (GTPS) are rarely occurring pathological findings in the posterior fossa with unclear etiology and ill-defined long-term prognosis.
  
  
  METHODS
  We present a case of a 15-year-old male diagnosed with posterior fossa GTPS. The patient remained asymptomatic during the 8-year follow-up after diagnosis with the serial magnetic resonance imaging (MRI) showing no change in the size and morphology of the lesion.
  
  
  CONCLUSIONS
  This case supports prior literature on supratentorial GTPS suggesting that the natural history of GTPS is mostly benign. Identification of GTPS in the posterior fossa could prevent the patient from unnecessary surgery or other aggressive treatment modalities.
authors: Department of Neurosurgery, University of Texas Health Science Center, San Antonio, Texas, USA.
authors: Byron C
authors: BC
authors: Branch
authors: Department of Radiology, University of Texas Health Science Center, San Antonio, Texas, USA.
authors: Bundhit
authors: B
authors: Tantiwongkosi
authors: Department of Radiology, University of Texas Health Science Center, San Antonio, Texas, USA.
authors: Wilson
authors: W
authors: Altmeyer
authors: Department of Neurosurgery, University of Texas Health Science Center, San Antonio, Texas, USA.
authors: Viktor
authors: V
authors: Bartanusz
keywords: Cerebral cyst; giant tumefactive perivascular spaces; posterior fossa; prognosis
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