title: Natural history of vestibular schwannomas and hearing loss in NF2 patients.
abstract: OBJECTIVE
  Bilateral vestibular schwannomas are the hallmark of neurofibromatosis 2 (NF2), occurring in 95% of patients. These tumors are associated with significant morbidity due to hearing loss, tinnitus, imbalance and facial weakness. As radiosurgery and chemotherapy have been recently introduced in the treatment armamentarium in addition to surgery, a thorough evaluation of vestibular schwannoma natural history is mandatory to determine the role and timing of each treatment modality.
  
  
  METHODS
  An exhaustive review of the literature was performed using the PubMed database concerning the natural history of tumor growth and hearing loss in NF2 patients with vestibular schwannomas.
  
  
  RESULTS
  Although some aspects of vestibular schwannoma natural history remain uncertain (pattern of tumor growth, mean tumor growth rate), factors influencing growth such as age at presentation and paracrine factors are well established. Studies focusing on the natural history of hearing have highlighted different patterns of hearing loss and the possible role of intralabyrinthine tumors. The polyclonality of vestibular schwannomas in NF2 was recently unveiled, giving a new perspective to their growth mechanisms.
  
  
  CONCLUSIONS
  An uniform evaluation of tumor growth using volumetric evaluation and hearing with standard classifications will ensure the use of common endpoints and should improve the quality of clinical trials as well as foster comparison among studies while ensuring more consistency in decision-making.
authors.affiliation: Service de neurochirurgie, hôpital de La Pitié-Salpêtrière, AP-HP, 75013 Paris, France; Université Pierre-et-Marie-Curie, Paris-VI, 75013 Paris, France.
authors.forename: M
authors.initials: M
authors.lastname: Peyre
authors.affiliation: Service d'otologie, d'otoneurochirurgie et de chirurgie cervico-faciale, hôpital de La Pitié-Salpêtrière, AP-HP, 75013 Paris, France; Université Pierre-et-Marie-Curie, Paris-VI, 75013 Paris, France.
authors.forename: D
authors.initials: D
authors.lastname: Bernardeschi
authors.affiliation: Université Pierre-et-Marie-Curie, Paris-VI, 75013 Paris, France; Université Pierre-et-Marie-Curie, Paris-VI, 75013 Paris, France.
authors.forename: O
authors.initials: O
authors.lastname: Sterkers
authors.affiliation: Service de neurochirurgie, hôpital de La Pitié-Salpêtrière, AP-HP, 75013 Paris, France; Université Pierre-et-Marie-Curie, Paris-VI, 75013 Paris, France. Electronic address: michel.kalamarides@psl.aphp.fr.
authors.forename: M
authors.initials: M
authors.lastname: Kalamarides
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D006309:Hearing / Q000502:physiology*; D034381:Hearing Loss / Q000601:surgery*; D006801:Humans; D008297:Male; D008875:Middle Aged; D016518:Neurofibromatosis 2 / Q000150:complications* / Q000601:surgery*; D009464:Neuroma, Acoustic / Q000601:surgery*; D016634:Radiosurgery / Q000379:methods; D016896:Treatment Outcome
keywords: Conservative treatment; Croissance tumorale; Histoire naturelle; Natural history; Neurofibromatose de type 2; Neurofibromatosis type 2; Schwannome vestibulaire; Traitement conservateur; Tumor growth; Vestibular schwannoma