Histological considerations of the cleavage plane for preservation of facial and cochlear nerve functions in vestibular schwannoma surgery: Clinical article

Tomio Sasaki, Tadahisa Shono, Kimiaki Hashiguchi, Fumiaki Yoshida, Satoshi O. Suzuki

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Object. The authors analyzed the tumor capsule and the tumor-nerve interface in vestibular schwannomas (VSs) to define the ideal cleavage plane for maximal tumor removal with preservation of facial and cochlear nerve functions. Methods. Surgical specimens from 21 unilateral VSs were studied using classical H & E, Masson trichrome, and immunohistochemical staining against myelin basic protein. Results. The authors observed a continuous thin connective tissue layer enveloping the surfaces of the tumors. Some nerve fibers, which were immunopositive to myelin basic protein and considered to be remnants of vestibular nerve fibers, were also identified widely beneath the connective tissue layer. These findings indicated that the socalled "tumor capsule" in VSs is the residual vestibular nerve tissue itself, consisting of the perineurium and underlying nerve fibers. There was no structure bordering the tumor parenchyma and the vestibular nerve fibers. In specimens of tumors removed en bloc with the cochlear nerves, the authors found that the connective tissue layer, corresponding to the perineurium of the cochlear nerve, clearly bordered the nerve fibers and tumor tissue. Conclusions. Based on these histological observations, complete tumor resection can be achieved by removal of both tumor parenchyma and tumor capsule when a clear border between the tumor capsule and facial or cochlear nerve fibers can be identified intraoperatively. Conversely, when a severe adhesion between the tumor and facial or cochlear nerve fibers is observed, dissection of the vestibular nerve-tumor interface (the subcapsular or subperineurial dissection) is recommended for preservation of the functions of these cranial nerves.

Original languageEnglish
Pages (from-to)648-655
Number of pages8
JournalJournal of Neurosurgery
Volume110
Issue number4
DOIs
Publication statusPublished - Apr 2009

All Science Journal Classification (ASJC) codes

  • Surgery
  • Clinical Neurology

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