title: [Idiopathic peri-cerebral enlargement in infants: simple anatomical variant or hemorrhagic risk factor?].
abstract: BACKGROUND
  Idiopathic subarachnoid space enlargement (ISSE) is usually regarded as a benign lesion.
  
  
  METHODS
  Two infants, 6 and 8 months old respectively, were hospitalized for neurological disorders revealing subdural hematoma. The first one was drowsy after an apparent life threatening event. The CT scan showed a recent subdural hematoma with ISSE. The outcome was spontaneously uneventful. The second patient presented a febrile hemiconvulsion preceding a status epilepticus. The diagnosis of empyema complicating subdural hematoma with ISSE was done on MRI. Recovery occurred after a 3 week course of parenteral antibiotics and 1 year of antiepileptic treatment. In these two cases, there was no history of head injury and the retrospective study of cranial perimeter growth curves showed acceleration before the acute event.
  
  
  CONCLUSIONS
  The reputation of benignity is not usurped regarding the ISSE. Nevertheless, it must be recognized as a factor furthering emergence of subdural hematoma, even in absence of injury context.
authors.affiliation: Service de pédiatrie, centre hospitalier de Versailles, Le Chesnay, France.
authors.forename: A
authors.initials: A
authors.lastname: Gout
authors.forename: I
authors.initials: I
authors.lastname: Gautier
authors.forename: M
authors.initials: M
authors.lastname: Bellaiche
authors.forename: J M
authors.initials: JM
authors.lastname: Pinard
authors.forename: M
authors.initials: M
authors.lastname: Tremon
authors.forename: D
authors.initials: D
authors.lastname: Rodriguez
authors.forename: P
authors.initials: P
authors.lastname: Foucaud
mesh_terms: D005260:Female; D006408:Hematoma, Subdural / Q000150:complications / Q000473:pathology*; D006801:Humans; D006849:Hydrocephalus / Q000150:complications / Q000473:pathology*; D007223:Infant; D008279:Magnetic Resonance Imaging; D008297:Male; D012307:Risk Factors; D013345:Subarachnoid Hemorrhage / Q000209:etiology; D015898:Tomography Scanners, X-Ray Computed