title: Glioblastoma multiforme mimicking a frontal abscess after surgery for a large vestibular schwannoma.
abstract: OBJECTIVE
  Routine vestibular schwannoma surgery can result in serious and potentially lethal infectious complications. A high degree of vigilance is necessary to diagnose these uncommon infections and in case of postoperative neurological symptoms, brain magnetic resonance imaging should be performed to eliminate a brain abscess. In some cases, the final diagnosis is not the expected one.
  
  
  METHODS
  A 39-year-old man presented three months postoperatively after a vestibular schwannoma removal by translabyrinthin approach with a rapid and progressive history of headaches, confusion, and left hemi paresis with fever. The brain CT and MRI were in favour of a delayed postoperative frontal abscess.
  
  
  METHODS
  A biopsy under stereotactic guidance was performed. Histopathologic examination revealed WHO grade 4 glioblastoma multiforme.
  
  
  CONCLUSIONS
  Symptoms and signs of glioblastoma multiforme are congruent with brain abscess. Its rapid evolution, the normality of the first magnetic resonance imaging, and its radiological aspect made it a differential diagnosis of a postoperative brain abscess and should be systematically researched.
authors.affiliation: Département d'otoneurochirurgie, Hospices Civils de Lyon, Centre Hospitalier Lyon-Sud, Pierre-Bénite, France.
authors.forename: C
authors.initials: C
authors.lastname: Fuchsmann
authors.forename: A
authors.initials: A
authors.lastname: Traverse-Glehen
authors.forename: M
authors.initials: M
authors.lastname: Durbec
authors.forename: C
authors.initials: C
authors.lastname: Dubreuil
authors.forename: S
authors.initials: S
authors.lastname: Tringali
mesh_terms: D000328:Adult; D001706:Biopsy; D001922:Brain Abscess / Q000175:diagnosis* / Q000473:pathology; D001932:Brain Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000532:radiotherapy / Q000601:surgery; D003131:Combined Modality Therapy; D003399:Craniotomy; D003937:Diagnosis, Differential; D007758:Ear, Inner / Q000601:surgery; D005625:Frontal Lobe / Q000473:pathology; D005909:Glioblastoma / Q000175:diagnosis* / Q000473:pathology / Q000532:radiotherapy / Q000601:surgery; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D016609:Neoplasms, Second Primary / Q000175:diagnosis* / Q000473:pathology / Q000532:radiotherapy / Q000601:surgery; D009464:Neuroma, Acoustic / Q000601:surgery*; D011183:Postoperative Complications / Q000175:diagnosis* / Q000473:pathology / Q000532:radiotherapy / Q000601:surgery; D018714:Radiotherapy, Adjuvant; D014057:Tomography, X-Ray Computed