51
|
Fukuda M, Oishi M, Hiraishi T, Saito A, Fujii Y. Intraoperative facial nerve motor evoked potential monitoring during skull base surgery predicts long-term facial nerve function outcomes. Neurol Res 2013; 33:578-82. [DOI: 10.1179/016164110x12700393823697] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
|
52
|
Carlson ML, Van Abel KM, Schmitt WR, Driscoll CL, Neff BA, Link MJ. The anatomically intact but electrically unresponsive facial nerve in vestibular schwannoma surgery. Neurosurgery 2013; 71:1125-30; discussion 1130. [PMID: 22986594 DOI: 10.1227/neu.0b013e318271bce3] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Permanent facial nerve (FN) paresis after vestibular schwannoma surgery is distressing to both the patient and surgeon. Intraoperative electrophysiological testing has proven invaluable in reducing the incidence of FN injury and may assist in prognosticating long-term function. OBJECTIVE To report definitive FN outcomes among a cohort of patients with an unevokable but anatomically intact seventh nerve after microsurgical vestibular schwannoma resection. METHODS All patients undergoing vestibular schwannoma surgery between 2000 and 2010 at a single tertiary academic referral center were identified. Intraoperative FN monitoring data and definitive FN outcomes were reviewed, and all patients with an anatomically intact but electrically unresponsive FN were included. RESULTS Eleven patients met the inclusion criteria. The median preoperative and definitive postoperative FN scores were House-Brackmann grades 1 and 3, respectively. The median time to definitive FN recovery was 9.4 months. CONCLUSION These data demonstrate that even among this extreme subset, modern electroprognostic testing strategies are incapable of reliably predicting poor outcomes. Therefore, if FN continuity is maintained, attempts at same-surgery FN repair should not be pursued.
Collapse
Affiliation(s)
- Matthew L Carlson
- Department of Otolaryngology Head and Neck Surgery, Mayo Clinic School of Medicine, Rochester, Minnesota 55905, USA.
| | | | | | | | | | | |
Collapse
|
53
|
Oh T, Nagasawa DT, Fong BM, Trang A, Gopen Q, Parsa AT, Yang I. Intraoperative neuromonitoring techniques in the surgical management of acoustic neuromas. Neurosurg Focus 2013; 33:E6. [PMID: 22937857 DOI: 10.3171/2012.6.focus12194] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Unfavorable outcomes such as facial paralysis and deafness were once unfortunate probable complications following resection of acoustic neuromas. However, the implementation of intraoperative neuromonitoring during acoustic neuroma surgery has demonstrated placing more emphasis on quality of life and preserving neurological function. A modern review demonstrates a great degree of recent success in this regard. In facial nerve monitoring, the use of modern electromyography along with improvements in microneurosurgery has significantly improved preservation. Recent studies have evaluated the use of video monitoring as an adjunctive tool to further improve outcomes for patients undergoing surgery. Vestibulocochlear nerve monitoring has also been extensively studied, with the most popular techniques including brainstem auditory evoked potential monitoring, electrocochleography, and direct compound nerve action potential monitoring. Among them, direct recording remains the most promising and preferred monitoring method for functional acoustic preservation. However, when compared with postoperative facial nerve function, the hearing preservation is only maintained at a lower rate. Here, the authors analyze the major intraoperative neuromonitoring techniques available for acoustic neuroma resection.
Collapse
Affiliation(s)
- Taemin Oh
- Department of Neurosurgery, David Geffen School of Medicine, University of California, Los Angeles, CA 90095-1761, USA
| | | | | | | | | | | | | |
Collapse
|
54
|
How Many Electromyography Channels Do We Need for Facial Nerve Monitoring? J Clin Neurophysiol 2012; 29:226-9. [DOI: 10.1097/wnp.0b013e318257cabc] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
|
55
|
Neurophysiologic monitoring of the spinal accessory nerve, hypoglossal nerve, and the spinomedullary region. J Clin Neurophysiol 2012; 28:587-98. [PMID: 22146361 DOI: 10.1097/wnp.0b013e31824079b3] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
This review of hypoglossal nerve, spinal accessory nerve, and spinomedullary region intraoperative monitoring details pertinent central and extramedullary anatomy, an updated understanding of proper free-run EMG recording methods and recent developments in stimulation technique and instrumentation. Mapping and monitoring the floor of the fourth ventricle, especially the vagal/hypoglossal trigone region, are emphasized. Although cranial nerve transcranial electrical motor evoked potential recordings can afford appreciation of corticobulbar/corticospinal tract function and secure a more dependable measure of proximate extramedullary somatoefferents, the sometimes difficult implementation and the, as yet, unresolved alert criteria of these recordings demand critical appraisal. Nearby and intimately associated cardiochronotropic and barocontrol neural networks are described; their better understanding is recommended as an important adjunct to "routine" neural monitoring. Finally, an Illustrative case is presented to highlight the many strengths and weaknesses of "state of the art" lower cranial nerve/spinomedullary region monitoring.
Collapse
|
56
|
The Potential of Quantified Lower Cranial Nerve EMG for Monitoring of Anesthetic Depth. J Neurosurg Anesthesiol 2012; 24:139-45. [DOI: 10.1097/ana.0b013e3182401cef] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
57
|
Utility of Electromyography for Nerve Root Monitoring During Spinal Surgery. J Clin Neurophysiol 2012; 29:140-8. [DOI: 10.1097/wnp.0b013e31824cece6] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
|
58
|
Kunert P, Smolarek B, Marchel A. Facial nerve damage following surgery for cerebellopontine angle tumours. Prevention and comprehensive treatment. Neurol Neurochir Pol 2012; 45:480-8. [PMID: 22127944 DOI: 10.1016/s0028-3843(14)60317-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Facial nerve (CN VII) palsy or even its transient paresis causes physical disability but is also a psychosocial problem. Immediately after vestibular schwannoma removal, different degrees of CN VII paresis occur in 20-70% of patients. Facial nerve paresis is observed in 10-40% after surgery of cerebellopontine angle meningiomas. Postoperative facial nerve weakness significantly reduces or completely withdraws with time in the majority of cases. However, even if prognosis for CN VII regeneration is good, proper management is needed because of the potential for serious ophthalmic complications. In this paper, the authors raise the issue of perioperative prophylaxis and comprehensive treatment of postoperative paresis of CN VII. Prophylaxis and treatment of ophthalmic complications are discussed. Current trends in the treatment of intraoperative loss of facial nerve continuity, management of facial paresis with good prognosis and dealing with facial palsy with no spontaneous recovery are also described in the paper.
Collapse
Affiliation(s)
- Przemysław Kunert
- Katedra i Klinika Neurochirurgii, Warszawski Uniwersytet Medyczny, ul. Banacha 1 A, Warszawa.
| | | | | |
Collapse
|
59
|
Novak K, Oberndorfer S. Electrophysiology and intraoperative neurophysiological monitoring. HANDBOOK OF CLINICAL NEUROLOGY 2012; 104:149-161. [PMID: 22230442 DOI: 10.1016/b978-0-444-52138-5.00012-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Affiliation(s)
- Klaus Novak
- Department of Neurosurgery, Medical University of Vienna, Vienna, Austria.
| | | |
Collapse
|
60
|
|
61
|
Neurophysiologic Intraoperative Monitoring of Trigeminal and Facial Nerves. J Clin Neurophysiol 2011; 28:551-65. [DOI: 10.1097/wnp.0b013e318241de1a] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
|
62
|
Rachinger J, Rampp S, Prell J, Scheller C, Alfieri A, Strauss C. Tumor origin and hearing preservation in vestibular schwannoma surgery. J Neurosurg 2011; 115:900-5. [PMID: 21800963 DOI: 10.3171/2011.7.jns102092] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECT Preservation of cochlear nerve function in vestibular schwannoma (VS) removal is usually dependent on tumor size and preoperative hearing status. Tumor origin as an independent factor has not been systematically investigated. METHODS A series of 90 patients with VSs, who underwent surgery via a suboccipitolateral route, was evaluated with respect to cochlear nerve function, tumor size, radiological findings, and intraoperatively confirmed tumor origin. All patients were reevaluated 12 months after surgery. RESULTS Despite comparable preoperative cochlear nerve status and larger tumor sizes, hearing preservation was achieved in 42% of patients with tumor originating from the superior vestibular nerve, compared with 16% of those with tumor originating from the inferior vestibular nerve. CONCLUSIONS Tumor origin is an important prognostic factor for cochlear nerve preservation in VS surgery.
Collapse
Affiliation(s)
- Jens Rachinger
- Department of Neurosurgery, Martin-Luther-University of Halle-Wittenberg, Halle, Germany.
| | | | | | | | | | | |
Collapse
|
63
|
Quantitative parameters of facial motor evoked potential during vestibular schwannoma surgery predict postoperative facial nerve function. Acta Neurochir (Wien) 2011; 153:1169-79. [PMID: 21455744 DOI: 10.1007/s00701-011-0995-4] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2010] [Accepted: 03/09/2011] [Indexed: 10/18/2022]
Abstract
BACKGROUND Facial motor evoked potential (FMEP) amplitude ratio reduction at the end of the surgery has been identified as a good predictor for postoperative facial nerve outcome. We sought to investigate variations in FMEP amplitude and waveform morphology during vestibular schwannoma (VS) resection and to correlate these measures with postoperative facial function immediately after surgery and at the last follow-up. METHODS Intraoperative orbicularis oculi and oris muscles FMEP data from 35 patients undergoing surgery for VS resection were collected, then analysed by surgical stage: initial, dural opening, tumour dissection (TuDis), tumour resection (TuRes) and final. FINDINGS Immediately after surgery, postoperative facial function correlated significantly with the FMEP amplitude ratio during TuDis, TuRes and final stages in both the orbicularis oculi (p = 0.003, 0.055 and 0.028, respectively) and oris muscles (p = 0.002, 0.104 and 0.014, respectively). At the last follow-up, however, facial function correlated significantly with the FMEP amplitude ratio only during the TuDis (p = 0.005) and final (p = 0.102) stages for the orbicularis oris muscle. At both time points, postoperative facial paresis correlated significantly with FMEP waveform deterioration in orbicularis oculi during the final stage (immediate, p = 0.023; follow-up, p = 0.116) and in orbicularis oris during the TuDis, TuRes and final stages (immediate, p = 0.071, 0.000 and 0.001, respectively; follow-up, p = 0.015, 0.001 and 0.01, respectively). CONCLUSIONS FMEP amplitude ratio and waveform morphology during VS resection seem to represent independent quantitative parameters that can be used to predict postoperative facial function. Event-to-baseline FMEP monitoring is quite useful to dictate when intraoperative changes in surgical strategy are warranted to reduce the chances of facial nerve injury.
Collapse
|
64
|
Abstract
OBJECTIVE The present study proposes an evolution of an intraoperative video-based facial nerve monitoring system for otologic and otoneurosurgical procedures in comparison with classical electromyographic (EMG) monitoring method. STUDY DESIGN Single-subject design study. SETTING Tertiary referral center, university clinic. PATIENTS Fifteen patients undergoing a translabyrinthine approach for removal of 2 cm or less acoustic neuroma. INTERVENTION Intraoperative monitoring during acoustic neuroma removal. MAIN OUTCOME MEASURES Measurement of mouth angle displacement and EMG peak amplitude at different stimulation intensities were measured and compared to evaluate the validity and reliability of the proposed new system. RESULTS The electrophysiologic method has been shown to be slightly more sensitive, although it shows limitations especially in terms of electrical artifacts during cauterization, totally masking the EMG monitoring. CONCLUSION The present version of video system can be considered as valid and reliable as EMG; its main advantages are the absence of electrical artifacts, less invasivity, and much less cost.
Collapse
|
65
|
Prell J, Rampp S, Rachinger J, Scheller C, Alfieri A, Marquardt L, Strauss C, Bau V. Botulinum toxin for temporary corneal protection after surgery for vestibular schwannoma. J Neurosurg 2011; 114:426-31. [DOI: 10.3171/2010.4.jns10104] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Object
High-grade postoperative facial nerve paresis after surgery for vestibular schwannoma with insufficient eye closure involves a risk for severe ocular complications. When conservative measurements are not sufficient, conventional invasive treatments include tarsorrhaphy and eyelid loading. In this study, injection of botulinum toxin into the levator palpebrae muscle was investigated as an alternative for temporary iatrogenic eye closure.
Methods
Injection of botulinum toxin was indicated by an interdisciplinary decision (neurosurgery and ophthalmology) in patients with a postoperative facial nerve paresis corresponding to a House-Brackmann Grade of IV or greater and documented abnormalities concerning corneal status such as keratopathia or conjunctival redness. Twenty-five IUs of botulinum toxin were injected transcutaneously and transconjunctivally.
Results
Six of 11 patients with high-grade paresis showed abnormal corneal findings in the early postoperative period. In 4 of these patients, botulinum toxin was injected; 1 patient declined the treatment, and in 1 patient it was not performed because of contralateral blindness. Temporary eye closure was achieved for 2 to 6 months in all cases. In all cases, facial nerve function had recovered sufficiently in terms of eye closure when the effect of botulinum toxin subsided.
Conclusion
The application of botulinum toxin for temporary iatrogenic eye closure is an excellent low-risk and temporary alternative to other invasive measures for the treatment of postoperative high-grade facial nerve paresis when the facial nerve is anatomically intact.
Collapse
Affiliation(s)
| | | | | | | | | | | | | | - Viktoria Bau
- 3Department of Ophthalmology, University of Dresden, Germany
| |
Collapse
|
66
|
Acioly MA, Liebsch M, Carvalho CH, Gharabaghi A, Tatagiba M. Transcranial Electrocortical Stimulation to Monitor the Facial Nerve Motor Function During Cerebellopontine Angle Surgery. Oper Neurosurg (Hagerstown) 2010; 66:354-61; discussion 362. [DOI: 10.1227/01.neu.0000369654.41677.b7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Abstract
OBJECTIVE
This study was conducted to investigate the success rate of using the facial motor evoked potential (FMEP) of orbicularis oculi and oris muscles for facial nerve function monitoring with use of a stepwise protocol, and its usefulness in predicting facial nerve outcome during cerebellopontine angle (CPA) surgeries.
METHODS
FMEPs were recorded intraoperatively from 60 patients undergoing CPA surgeries. Transcranial electrocortical stimulation (TES) was performed using corkscrew electrodes positioned at hemispheric montage (C3/C4 and CZ). The contralateral abductor pollicis brevis muscle was used as the control response. Stimulation was always applied contralaterally to the affected side using 1, 3, or 5 rectangular pulses ranging from 200 to 600 V with 50 μs of pulse duration and an interstimulus interval of 2 ms. Facial potentials were recorded from needles placed in the orbicularis oculi and oris muscles.
RESULTS
FMEP from the orbicularis oris and oculi muscles could be reliably monitored in 86.7% and 85% of the patients, respectively. The immediate postoperative facial function correlated significantly with the FMEP ratio in the orbicularis oculi muscle at 80% amplitude ratio (P = .037) and orbicularis oris muscle at 35% ratio (P = .000). FMEP loss was always related to postoperative facial paresis, although in different degrees.
CONCLUSION
FMEPs can be obtained reliably by using TES with 3 to 5 train pulses. Stable intraoperative FMEPs can predict a good postoperative outcome of facial function. However, further refinements of this technique are necessary to minimize artifacts and to make this method more reliable.
Collapse
Affiliation(s)
- Marcus André Acioly
- Department of Neurosurgery, University of Tübingen, Tübingen, Germany, and Department of Neurology, University of São Paulo, São Paulo, Brazil
| | - Marina Liebsch
- Department of Neurosurgery, University of Tübingen, Tübingen, Germany
| | | | | | - Marcos Tatagiba
- Department of Neurosurgery, University of Tübingen, Tübingen, Germany
| |
Collapse
|
67
|
Prell J, Rachinger J, Scheller C, Alfieri A, Strauss C, Rampp S. A Real-Time Monitoring System for the Facial Nerve. Neurosurgery 2010; 66:1064-73; discussion 1073. [DOI: 10.1227/01.neu.0000369605.79765.3e] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Abstract
OBJECTIVE
Damage to the facial nerve during surgery in the cerebellopontine angle is indicated by A-trains, a specific electromyogram pattern. These A-trains can be quantified by the parameter “traintime,” which is reliably correlated with postoperative functional outcome. The system presented was designed to monitor traintime in real-time.
METHODS
A dedicated hardware and software platform for automated continuous analysis of the intraoperative facial nerve electromyogram was specifically designed. The automatic detection of A-trains is performed by a software algorithm for real-time analysis of nonstationary biosignals. The system was evaluated in a series of 30 patients operated on for vestibular schwannoma.
RESULTS
A-trains can be detected and measured automatically by the described method for real-time analysis. Traintime is monitored continuously via a graphic display and is shown as an absolute numeric value during the operation. It is an expression of overall, cumulated length of A-trains in a given channel; a high correlation between traintime as measured by real-time analysis and functional outcome immediately after the operation (Spearman correlation coefficient [ρ] = 0.664, P < .001) and in long-term outcome (ρ = 0.631, P < .001) was observed.
CONCLUSION
Automated real-time analysis of the intraoperative facial nerve electromyogram is the first technique capable of reliable continuous real-time monitoring. It can critically contribute to the estimation of functional outcome during the course of the operative procedure.
Collapse
Affiliation(s)
- Julian Prell
- Department of Neurosurgery, University of Halle, Halle, Germany
| | - Jens Rachinger
- Department of Neurosurgery, University of Halle, Halle, Germany
| | | | - Alex Alfieri
- Department of Neurosurgery, University of Halle, Halle, Germany
| | | | - Stefan Rampp
- Department of Neurosurgery, University of Halle, Halle, Germany
| |
Collapse
|
68
|
Youssef AS, Downes AE. Intraoperative neurophysiological monitoring in vestibular schwannoma surgery: advances and clinical implications. Neurosurg Focus 2009; 27:E9. [PMID: 19795957 DOI: 10.3171/2009.8.focus09144] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECT Intraoperative neurophysiological monitoring has become an integral part of vestibular schwannoma surgery. The aim of this article was to review the different techniques of intraoperative neurophysiological monitoring in vestibular schwannoma surgery, identify the clinical impact of certain pathognomonic patterns on postoperative outcomes of facial nerve function and hearing preservation, and highlight the role of postoperative medications in improving delayed cranial nerve dysfunction in the different reported series. METHODS The authors performed a review of the literature regarding intraoperative monitoring in acoustic/vestibular schwannoma surgery. The different clinical series representing different monitoring techniques were reviewed. All the data from clinical series were analyzed in a comprehensive and comparative model. RESULTS Intraoperative brainstem auditory evoked potential monitoring, direct cochlear nerve action potential monitoring, and facial nerve electromyography are the main tools used to assess the functional integrity of an anatomically intact cranial nerve. The identification of pathognomonic brainstem auditory evoked potential and electromyography patterns has been correlated with postoperative functional outcome. Recently, perioperative administration of intravenous hydroxyethyl starch and nimodipine as vasoactive and neuroprotective agents was shown to improve vestibular schwannoma functional outcome in few reported studies. CONCLUSIONS Recent advances in electrophysiological technology have considerably contributed to improvement in functional outcome of vestibular neuroma surgery in terms of hearing preservation and facial nerve paresis. Perioperative intravenous nimodipine and hydroxyethyl starch may be valuable additions to surgery.
Collapse
Affiliation(s)
- A Samy Youssef
- Department of Neurosurgery, University of South Florida, Tampa, Florida 33606, USA.
| | | |
Collapse
|
69
|
Intraoperative Monitoring of the Recurrent Laryngeal Nerve During Revision Thyroid Surgery. Otolaryngol Clin North Am 2008; 41:1147-54, ix. [DOI: 10.1016/j.otc.2008.05.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
70
|
Spontaneous Electromyographic Activity During Microvascular Decompression in Trigeminal Neuralgia. J Clin Neurophysiol 2008; 25:225-32. [DOI: 10.1097/wnp.0b013e31817f368f] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
|
71
|
Strauss C, Bischoff B, Romstöck J, Rachinger J, Rampp S, Prell J. Hearing preservation in medial vestibular schwannomas. J Neurosurg 2008; 109:70-6. [DOI: 10.3171/jns/2008/109/7/0070] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Object
Vestibular schwannomas (VSs) with no or little extension into the internal auditory canal have been addressed as a clinical subentity carrying a poor prognosis regarding hearing preservation, which is attributed to the initially asymptomatic intracisternal growth pattern. The goal in this study was to assess hearing preservation in patients who underwent surgery for medial VSs.
Methods
A consecutive series of 31 cases in 30 patients with medial VSs (mean size 31 mm) who underwent surgery between 1997 and 2005 via a suboccipitolateral route was evaluated with respect to pre- and postoperative cochlear nerve function, extent of tumor removal, and radiological findings. Intraoperative monitoring of brainstem auditory evoked potentials was performed in all patients with hearing. Patients were reevaluated at a mean of 30 months following surgery.
Results
Preoperative hearing function revealed American Academy of Otolaryngology–Head and Neck Surgery Foundation Classes A and B in 7 patients each, Class C in 4, and D in 9. Four patients presented with deafness. Hearing preservation was achieved in 10 patients (Classes A–C in 2 patients each, and Class D in 4 patients). Tumor removal was complete in all patients with hearing preservation, except for 2 patients with neurofibromatosis. In 4 patients a planned subtotal excision was performed due to the individual's age or underlying disease. In 1 patient a recurrent tumor was completely removed 3 years after the initial procedure.
Conclusions
The cochlear nerve in medial VSs requires special attention due to the atypical intracisternal growth pattern. Even in large tumors, hearing could be preserved in 37% of cases, since the cochlear nerve in medial schwannomas may not exhibit the adherence to the tumor capsule seen in tumors with comparable size involving the internal auditory canal.
Collapse
Affiliation(s)
- Christian Strauss
- 1Department of Neurosurgery, Martin Luther University of Halle–Wittenberg, Halle; and
| | - Barbara Bischoff
- 2Department of Neurosurgery, University of Erlangen–Nürnberg, Erlangen, Germany
| | - Johann Romstöck
- 2Department of Neurosurgery, University of Erlangen–Nürnberg, Erlangen, Germany
| | - Jens Rachinger
- 1Department of Neurosurgery, Martin Luther University of Halle–Wittenberg, Halle; and
| | - Stefan Rampp
- 1Department of Neurosurgery, Martin Luther University of Halle–Wittenberg, Halle; and
| | - Julian Prell
- 1Department of Neurosurgery, Martin Luther University of Halle–Wittenberg, Halle; and
| |
Collapse
|
72
|
Scheller C, Rachinger J, Prell J, Kornhuber M, Strauss C. Schwannoma of the intermediate nerve. J Neurosurg 2008; 109:144-8. [DOI: 10.3171/jns/2008/109/7/0144] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The intermediate nerve is seldom identified as the site of tumor origin in cerebellopontine angle schwannomas. A 29-year-old man presented with a 6-month history of slowly progressive hearing loss and dizziness; facial nerve weakness was not observed clinically. Magnetic resonance imaging revealed a tumor in the left cerebellopontine angle region extending up to the geniculate ganglion and along the course of the superficial petrosal nerve. A CT scan showed enlargement of the facial nerve canal. Microsurgery was performed via an extended retrosigmoid approach. Intraoperative and electrophysiological findings identified the intermediate nerve as the site of tumor origin.
Collapse
Affiliation(s)
| | | | | | - Malte Kornhuber
- 2Neurology, Martin-Luther University of Halle-Wittenberg, Halle, Germany
| | | |
Collapse
|
73
|
Yingling CD, Gardi JN. Intraoperative Monitoring of Facial and Cochlear Nerves During Acoustic Neuroma Surgery. Neurosurg Clin N Am 2008; 19:289-315, vii. [DOI: 10.1016/j.nec.2008.02.011] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|