title: Spontaneous posterior fossa hemorrhage associated with low-molecular weight heparin in an adolescent recently diagnosed with posterior reversible encephalopathy syndrome: case report and review of the literature.
abstract: BACKGROUND
  Posterior reversible encephalopathy syndrome (PRES) constitutes a well-described clinical entity, classically entailing characteristic edematous lesions on imaging studies in a patient with altered mental status, visual disturbances, headache, and seizures. PRES is reversible in the vast majority of cases, although progression to ischemia and hemorrhage has been documented.
  
  
  METHODS
  We report a case of a 16-year-old male with chronic renal failure who developed PRES during a hypertensive crisis. The hypertension was successfully managed and PRES-associated symptomatology showed complete regression. However, approximately 2 months later, the patient returned with a spontaneous posterior fossa hemorrhage. Two weeks before this second admission, treatment with low-molecular weight heparin had been initiated. The patient finally succumbed, despite surgical evacuation. The pertinent literature is reviewed.
  
  
  CONCLUSIONS
  We suggest that the administration of low-molecular weight heparin in the setting of recent PRES might increase the risk for the development of intracranial hemorrhage.
authors.affiliation: Department of Neurosurgery, Medical Center of Central Georgia, Mercer University School of Medicine, Macon, GA, USA.
authors.forename: Theofilos G
authors.initials: TG
authors.lastname: Machinis
authors.forename: Kostas N
authors.initials: KN
authors.lastname: Fountas
authors.forename: Vassilios G
authors.initials: VG
authors.lastname: Dimopoulos
authors.forename: E Christopher
authors.initials: EC
authors.lastname: Troup
mesh_terms: D000293:Adolescent; D006495:Heparin, Low-Molecular-Weight / Q000009:adverse effects*; D006801:Humans; D020343:Hypertensive Encephalopathy / Q000188:drug therapy / Q000209:etiology; D020300:Intracranial Hemorrhages / Q000209:etiology* / Q000473:pathology; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D051437:Renal Insufficiency / Q000150:complications; D014057:Tomography, X-Ray Computed / Q000379:methods
chemical_list: D006495:Heparin, Low-Molecular-Weight