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Int Arch Otorhinolaryngol 2012; 16(04): 466-475
DOI: 10.7162/S1809-97772012000400007
Original Article
Thieme Publicações Ltda Rio de Janeiro, Brazil

Vestibular schwannoma: 825 cases from a 25-year experience

Mariana Hausen Pinna
1   Specialist ENT. Physician Group Otology HCFMUSP.
,
Ricardo Ferreira Bento
2   Full Professor. Head of Clinical Otolaryngology, University of São Paulo School of Medicine. Chief of Otology, HCFMUSP
,
Rubens Vuono de Brito Neto
3   Full Professor, Division of Clinical Otolaryngology, HCFMUSP
› Author Affiliations
Further Information

Publication History

16 April 2012

31 July 2012

Publication Date:
10 December 2013 (online)

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Summary

Introduction: Acoustic nerve tumors have been recognized as a clinico-pathologic entity for at least 200 years, and they represent 90% of cerebellopontine angle diseases. Histologically, the tumors are derived from Schwann cells of the myelin sheath, with smaller tumors consisting of elongated palisade cells, while in large tumors, cystic degeneration can be found in the central areas, possibly due to deficient vascularization. We retrospectively reviewed 825 cases of vestibular schwannomas, reported between January 1984 and August 2006, in which the patients underwent surgery to remove the tumor.

Objective: To evaluate signs, symptoms, aspects of clinical diagnosis, including the results of audiological and imaging studies, and surgical techniques and complications.

Methods: A retrospective chart review. The medical records of all patients undergoing surgical treatment for schwannoma during the period indicated were reviewed.

Results and Conclusion: Hearing loss was the first symptom reported in almost all cases, and tumor size was not proportional to the impairment of the auditory threshold. The surgical techniques allowed safe preservation of facial function. In particular, the retrolabyrinthine route proved useful in small tumors, with 50% preservation of hearing.

Keywords

neuroma - acoustic - vestibulocochlear nerve diseases - cranial nerve neoplasms
 

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