Abstract
Background and objective
Goals of small vestibular schwannoma (VS) microneurosurgery are as follows: radical resection, facial nerve (FN) preservation, and hearing preservation (HP). Microsurgical advances make HP possible in many patients with preoperative socially useful hearing (SUH). We evaluated postoperative HP in VS with maximum diameter < 2 cm monitored with two different auditory brainstem response (ABR) techniques.
Materials and methods
Twenty-eight consecutive non-randomized patients with SUH suffering from small VS underwent keyhole microneurosurgery by retrosigmoid (RS) approach. Selection criteria are as follows: speech discrimination > 50%, pure tone audiogram < 50 dB loss (50/50 criterion; AAO-HNS classes A–B), maximum diameter < 2 cm. HP was attempted with intraoperative ABR, evoked by classical Click (16 cases, group 1) and LS-CE-Chirp® stimulus (12, group 2).
Results
Mean age was 47.5 years (16–75); average maximum diameter was 1.35 cm (0.5–1.9 mm). Total and nearly total resection (> 95%) was obtained in all, as confirmed by 24–48-h postoperative enhanced MRI. Mortality and major morbidity were 0. In all cases, FN was preserved; in 3, incomplete deficit recovered within few weeks. Socially useful HP (pre- and postoperatively) was 64.3% (18 of 28): 56.25% group 1 and 75% group 2 (p = NS). Postoperative ipsilateral deafness was observed in 5 cases of group 1 (p < 0.0001). Preoperative tinnitus had negative impact on HP (p < 0.05).
Conclusions
Microsurgery can cure small growing VS with SUH. Our limited experience confirms that keyhole RS removal assisted by intraoperative ABR monitoring leads to valuable rates of SUH. LS-CE-Chirp–evoked ABRs allow a safe, effective, and clear neurophysiological feedback and are faster and, thus, more useful than the Click-ABR.
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References
American Academy of Otolaryngology-Head and Neck Surgery Foundation I (1995) Committee on hearing and equilibrium guidelines for the evaluation of hearing preservation in acoustic neuroma (vestibular schwannoma). Otolaryngol Head Neck Surg 113:179–180
Bakkouri WE, Kania RE, Guichard JP et al (2009) Conservative management of 386 cases of unilateral vestibular schwannoma: tumor growth and consequences for treatment Clinical article. J Neurosurg 110:662–669
Brackmann DE, Owens RM, Friedman RA et al (2000) Prognostic factors for hearing preservation in vestibular schwannoma surgery. Am J Otolaryngol 21:417–424
Di Scipio E, Mastronardi L (2015) CE-Chirp® ABR in cerebellopontine angle surgery neuromonitoring: technical assessment in four cases. Neurosurg Rev 38:381–384
Dornhoffer JL, Helms J, Hohmann DH (1995) Hearing preservation in acoustic tumor surgery: results and prognostic factors. Laryngoscope 105:184–187
Elberling C, Callo J, Don M (2010) Evaluating auditory brainstem responses to different chirp stimuli at three levels of stimulation. J Acoust Soc Am 128:215–223
Elliott A, Hebb AL, Walling S et al (2015) Hearing preservation in vestibular schwannoma management. Am J Otolaryngol 36:526–534
Gardner G, Robertson JH (1988) Hearing preservation in unilateral acoustic neuroma surgery. Ann Otol Rhinol Laryngol 97:55–66
Golfinos JG, Hill TC, Rokosh R et al (2016) A matched cohort comparison of clinical outcomes following microsurgical resection or stereotactic radiosurgery for patients with small- and medium-sized33, vestibular schwannomas. J Neurosurg 125:1472–1482
He YB, Yu CJ, Ji HM et al (2016) Significance of vestibular testing on distinguishing the nerve of origin for vestibular schwannoma and predicting the preservation of hearing. Chin Med J 129:799–803
House JW, Brackmann DE (1985) Facial nerve grading system. Otolaryngol Head Neck Surg 93:146–147
Joo BE, Park SK, Cho KR et al (2016) Real-time intraoperative monitoring of brainstem auditory evoked potentials during microvascular decompression for hemifacial spasm. J Neurosurg 125:1061–1067
Koh ES, Millar BA, Menard C et al (2007) Fractionated stereotactic radiotherapy for acoustic neuroma: single-institution experience at the Princess Margaret hospital. Cancer 109:1203–1210
Lobato-Polo J, Kondziolka D, Zorro O et al (2009) Gamma knife radiosurgery in younger patients with vestibular schwannomas. Neurosurgery 65:294–300
Mastronardi L, Cacciotti G, Di Scipio E et al (2016) Safety and usefulness of flexible hand-held laser fibers in microsurgical removal of acoustic neuromas (vestibular schwannomas). Clin Neurol Neurosurg 145:35–40
Mastronardi L, Cacciotti G, Roperto R et al (2016) Position and course of facial nerve and postoperative facial nerve results in vestibular schwannoma microsurgery. World Neurosurg 94:174–180
Mendelsohn D, Westerberg BD, Dong C et al (2016) Clinical and radiographic factors predicting hearing preservation rates in large vestibular schwannomas. J Neurol Surg B Skull Base 77:193–198
Mousavi SH, Niranjan A, Akpinar B et al (2016) Hearing subclassification may predict long-term auditory outcomes after radiosurgery for vestibular schwannoma patients with good hearing. J Neurosurg 125:845–852
Niranjan A, Mathieu D, Flickinger JC et al (2008) Hearing preservation after intracanalicular vestibular schwannoma radiosurgery. Neurosurgery 63:1054–1063
Roessler K, Krawagna M, Bischoff B et al (2016) Improved postoperative facial nerve and hearing function in retrosigmoid vestibular schwannoma surgery significantly associated with semisitting position. World Neurosurg 87:290–297
Rowe JG, Radatz MW, Walton L et al (2003) Gamma knife stereotactic radiosurgery for unilateral acoustic neuromas. J Neurol Neurosurg Psychiatry 74:1536–1542
Rueß D, Pöhlmann L, Grau S et al (2017) Long-term follow-up after stereotactic radiosurgery of intracanalicular acoustic neurinoma. Radiat Oncol 12:68–76
Sameshima T Mastronardi L, Friedman AH, et al (eds) (2007). Microanatomy and dissection of temporal bone for surgery of acoustic neuroma and petroclival meningioma. Second Edition. Raleigh (NC, USA) AF Neurovideo, Inc.
Sameshima T, Fukushima T, McElveen JT Jr et al (2010) Critical assessment of operative approaches for hearing preservation in small acoustic neuroma surgery: retrosigmoid vs middle fossa. Neurosurgery 67:640–644
Samii M, Matthies C (1997) Management of 1000 vestibular schwannomas (acoustic neuromas): surgical management and results with an emphasis on complications and how to avoid them. Neurosurgery 40:11–23
Samii M (1989) Tumors of the internal auditory canal and cerebellopontine angle: I- acoustic neuroma. In: Samii M, Draf W (eds) Surgery of the skull base: an interdisciplinary approach. Springer Verlag, New York, pp 377–395
Samii M, Gerganov V, Samii A (2006) Improved preservation of hearing and facial nerve function in vestibular schwannoma surgery via the retrosigmoid approach in a series of 200 patients. J Neurosurg 105:527–535
Satar B, Yetiser S, Özkaptan Y (2003) Impact of tumor size on hearing outcome and facial function with the middle fossa approach for acoustic neuroma: a meta-analytic study. Acta Otolaryngol 123:499–505
Scheller C, Wienke A, Tatagiba M et al (2016) Stability of hearing preservation and regeneration capacity of the cochlear nerve following vestibular schwannoma surgery via a retrosigmoid approach. J Neurosurg 125:1277–1282
Sughrue ME, Yang I, Aranda D et al (2010) The natural history of untreated sporadic vestibular schwannomas: a comprehensive review of hearing outcomes Clinical article. J Neurosurg 112:163–167
Tamura M, Carron R, Yomo S et al (2009) Hearing preservation after gamma knife radiosurgery for vestibular schwannomas presenting with high-level hearing. Neurosurgery 64:289–296
Tonn JC, Schlake HP, Goldbrunner R et al (2000) Acoustic neuroma surgery as an interdisciplinary approach: a neurosurgical series of 508 patients. J Neurol Neurosurg Psychiatry 69:161–166
Wanibuchi M, Fukushima T, Friedman AH et al (2014) Hearing preservation surgery for vestibular schwannomas via the retrosigmoid transmeatal approach: surgical tips. Neurosurg Rev 37:431–444
Watanabe S, Yamamoto M, Kawabe T et al (2016) Stereotactic radiosurgery for vestibular schwannomas: average 10-year follow-up results focusing on long-term hearing preservation. J Neurosurg 125:64–72
Yamakami I, Uchino Y, Kobayashi E et al (2003) Conservative management, gamma-knife radiosurgery, and microsurgery for acoustic neurinomas: a systematic review of outcome and risk of three therapeutic options. Neurol Res 25:682–690
Yamakami I, Ito S, Higuchi Y (2014) Retrosigmoid removal of small acoustic neuroma: curative tumor removal with preservation of function. J Neurosurg 121:554–563
Yamakami I, Yoshinori H, Saeki N et al (2009) Hearing preservation and intraoperative auditory brainstem response and cochlear nerve compound action potential monitoring in the removal of small acoustic neurinoma via the retrosigmoid approach. J Neurol Neurosurg Psychiatry 80:218–227
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Mastronardi, L., Di Scipio, E., Cacciotti, G. et al. Hearing preservation after removal of small vestibular schwannomas by retrosigmoid approach: comparison of two different ABR neuromonitoring techniques. Acta Neurochir 161, 69–78 (2019). https://doi.org/10.1007/s00701-018-3740-4
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DOI: https://doi.org/10.1007/s00701-018-3740-4