Article
Otorhinolaryngology
Catherine Sobieski, Daniel E. Killeen, Samuel L. Barnett, Bruce E. Mickey, Jacob B. Hunter, Brandon Isaacson, Joe Walter Kutz
Summary: Facial nerve outcomes one year after microsurgical resection are poorer in patients with NF2 tumors compared to sporadic tumors, particularly for tumors with a volume greater than 3 cm³ and those classified as NF2 tumors.
OTOLARYNGOLOGY-HEAD AND NECK SURGERY
(2021)
Review
Medicine, General & Internal
Leonardo Franz, Gino Marioni, Antonio Mazzoni, Cosimo de Filippis, Elisabetta Zanoletti
Summary: This narrative review provides an update on the patho-physiological and clinical issues related to facial nerve damage in oto-neurological and skull base surgery. The occurrence of intraoperative facial nerve damage is associated with the anatomical relationship between tumor and nerve, the trajectory of the surgical corridor, and the boundaries of the resection margins. Mechanisms such as stretching, compression, devascularization, and heating may contribute to intraoperative facial nerve damage and nerve regeneration disorders.
JOURNAL OF CLINICAL MEDICINE
(2023)
Article
Clinical Neurology
Felix Arlt, Johannes Kasper, Dirk Winkler, Katja Jaehne, Michael Karl Fehrenbach, Juergen Meixensberger, Caroline Sander
Summary: Intraoperative neurophysiological monitoring is crucial in vestibular schwannoma surgery to prevent nerve injury. Repeated direct nerve stimulation and a detected decreased amplitude might show facial nerve function deterioration.
FRONTIERS IN NEUROLOGY
(2022)
Article
Oncology
Giuseppe Di Perna, Raffaele De Marco, Bianca Maria Baldassarre, Enrico Lo Bue, Fabio Cofano, Pietro Zeppa, Luca Ceroni, Federica Penner, Antonio Melcarne, Diego Garbossa, Michele Maria Lanotte, Francesco Zenga
Summary: This retrospective study aimed to investigate the impact of morphologic and neurophysiological factors on the short- and long-term facial nerve function after vestibular schwannoma resection. A multiparametric score, Facial Nerve Outcome Score (FNOS), was developed and shown to be a reliable predictor of facial nerve function.
FRONTIERS IN ONCOLOGY
(2023)
Article
Medicine, Research & Experimental
Candace E. Hobson, Joe Saliba, Nopawan Vorasubin, Robert H. Lyles, Bill Mastrodimos, Roberto A. Cueva
Summary: This study shows that the position of vestibular schwannoma relative to the IAC axis can be used along with tumor size to predict postoperative facial outcomes. A greater proportion of tumor posterior to the IAC axis was associated with significantly better facial outcomes.
Article
Medicine, General & Internal
Won Jae Lee, Jung-Il Lee, Jung-Won Choi, Doo-Sik Kong, Do-Hyun Nam, Yang-Sun Cho, Hyung Jin Shin, Ho Jun Seol
Summary: Residual tumor volume was found to be associated with tumor progression in patients with residual vestibular schwannomas after adjuvant gamma knife radiosurgery following subtotal resection. A cut-off volume of 6.4 cm(3) for residual tumor volume was identified to predict the greatest difference in progression-free survival, while the preservation of facial nerve function was not significantly correlated with the size of residual tumor volume.
JOURNAL OF KOREAN MEDICAL SCIENCE
(2021)
Article
Neurosciences
Kathrin Machetanz, Florian Grimm, Ruth Schaefer, Leonidas Trakolis, Helene Hurth, Patrick Haas, Alireza Gharabaghi, Marcos Tatagiba, Georgios Naros
Summary: This study introduces a cost-effective custom-made EMG biofeedback system for facial rehabilitation, demonstrating its good application potential in both healthy subjects and patients with facial palsy. There is a correlation between electrophysiological measurements and clinical outcomes.
FRONTIERS IN NEUROSCIENCE
(2022)
Review
Medicine, Research & Experimental
Longping Yao, Baoyan Wang, Fengfei Lu, Xiaozheng He, Guohui Lu, Shizhong Zhang
Summary: The facial nerve, a mixed nerve, has sensory and motor fibers, with its main branch located in the cerebellopontine angle. Facial nerve dysfunction can occur in skullbase tumors and Bell's palsy, with recovery outcomes varying between the two. Recent advances in MRI technology have allowed for better visualization of the facial nerve in the presence of large tumors.
EUROPEAN JOURNAL OF MEDICAL RESEARCH
(2023)
Article
Medicine, Research & Experimental
Isaac D. Erbele, Micah L. Klumpp, Moises A. Arriaga
Summary: Preoperative functional testing cannot reliably predict the presence of intracranial facial schwannomas. Hearing is better in facial schwannomas, especially in lower frequencies, while patients with vestibular schwannomas have worse hearing outcomes.
Editorial Material
Clinical Neurology
Ufuk Erginoglu, Walid Elshamy, Mustafa K. Baskaya
Summary: Preserving facial nerve function is crucial in translabyrinthine approach for vestibular schwannoma surgery. Anatomical variations in the facial nerve are rare but can be associated with congenital abnormalities. We present a rare case of vestibular schwannoma with a bifurcated facial nerve. The patient had a successful postoperative recovery with Grade I outcome. This case highlights the importance of identifying and preserving the facial nerve during vestibular schwannoma resection.
WORLD NEUROSURGERY
(2022)
Article
Clinical Neurology
Yang Sun, Jianhua Yang, Tang Li, Kaiming Gao, Xiaoguang Tong
Summary: This study has established a new nomogram for predicting the rates of poor facial nerve outcomes after vestibular schwannoma surgery, which includes significant prognostic factors. The nomogram showed good discrimination and calibration in the validation cohort.
FRONTIERS IN NEUROLOGY
(2022)
Article
Clinical Neurology
Mohamed Elsayed, Huan Jia, Baptiste Hochet, Olivier Sterkers, Renato Torres, Yann Nguyen, Isabelle Bernat, Ghizlene Lahlou, Michel Kalamarides
Summary: Decision-making for large sporadic vestibular schwannomas resection can be guided by intraoperative monitoring of maximal facial nerve amplitude and latency response to optimize post-operative results. Tumors were removed through retrosigmoid or translabyrinthine approaches in patients with normal preoperative FN function, achieving some tumor removal while maintaining a certain decrease in amplitude. Good postoperative facial nerve function and significant hearing preservation were achieved after 6 months, with no significant difference observed between TR and NTR+STR procedures.
ACTA NEUROCHIRURGICA
(2021)
Article
Clinical Neurology
Nolan Ung, Panayotis E. Pelargos, Khashayar Mozaffari, Monica Mathur, Courtney Duong, Lawrance K. Chung, Kevin Ding, Nikhilesh S. Bhatt, Natalie Barnette, Brittany Voth, Quinton Gopen, Isaac Yang
Summary: DTI tractography is an accurate tool to visualize and locate the facial nerve during surgical resection of Vestibular Schwannomas, potentially reducing postoperative facial nerve damage.
JOURNAL OF THE NEUROLOGICAL SCIENCES
(2021)
Article
Otorhinolaryngology
Yin Ren, Bridget MacDonald, Kareem O. Tawfik, Marc S. Schwartz, Rick A. Friedman
Summary: Clinical predictors of facial nerve outcomes after microsurgical resection of vestibular schwannoma were identified, indicating excellent outcomes can be achieved with this procedure. Gross total resection and >= 100-mu V intraoperative FN electromyographic response were found to predict excellent FN outcomes.
OTOLARYNGOLOGY-HEAD AND NECK SURGERY
(2021)
Article
Oncology
Tobias Greve, Liang Wang, Sophie Katzendobler, Lucas L. Geyer, Christian Schichor, Joerg Christian Tonn, Andrea Szelenyi
Summary: The study compared different warning criteria for facial nerve MEP monitoring during surgery for vestibular schwannomas. It found that using the percent change in ipsilateral versus contralateral MEP stimulation intensity over time as a warning criterion along with an optimistic approach significantly improved specificity and reduced unnecessary warnings.
Article
Otorhinolaryngology
Sophia Tran, Daniel E. Killeen, Shafeen Qazi, Sanjana Balachandra, Jacob B. Hunter
Summary: This study assessed the impact of medication use, specifically statin, metformin, and aspirin, on the growth of vestibular schwannomas (VSs), and found that metformin is associated with reduced VS growth.
OTOLARYNGOLOGY-HEAD AND NECK SURGERY
(2021)
Article
Clinical Neurology
Daniel E. Killeen, Anthony M. Tolisano, Brandon Isaacson, J. Walter Kutz, Samuel Barnett, Zabi Wardak, Jacob B. Hunter
Summary: The objective of this study was to determine if pretreatment growth of sporadic vestibular schwannomas (VS) predicts postradiosurgery response. The findings showed that smaller pretreatment tumor volume and greater linear tumor growth rates were associated with postradiosurgery tumor enlargement, controlling for age, gender, and radiation dose.
JOURNAL OF NEUROLOGICAL SURGERY PART B-SKULL BASE
(2022)
Editorial Material
Medicine, Research & Experimental
Daniel E. Killeen, Joe W. Kutz, Jacob B. Hunter, Brandon Isaacson
Article
Oncology
John P. Marinelli, Zane Schnurman, Daniel E. Killeen, Ashley M. Nassiri, Jacob B. Hunter, Katherine A. Lees, Christine M. Lohse, J. Thomas Roland, John G. Golfinos, Douglas Kondziolka, Michael J. Link, Matthew L. Carlson
Summary: This study aims to characterize the natural history of sporadic vestibular schwannoma volumetric tumor growth. The findings suggest that prior tumor growth does not perfectly predict future growth, as tumors can subsequently grow faster, slower, or demonstrate quiescence and stability.
Article
Clinical Neurology
Patrick Lynch, Tanner Mitton, Daniel E. Killeen, Joe Walter Kutz, Mark Newcomer
Summary: This study retrospectively analyzed the etiologies, characteristics, and diagnostic workup of patients with pulsatile tinnitus (PT). The results showed that patients with identifiable etiologies of PT were more likely to have hypertension, obesity, vision changes, ipsilateral asymmetric hearing loss, or an abnormal otologic examination. MRI with contrast and CT without contrast were equally effective in identifying specific etiologies, with MRI preferred for neoplasms and CT preferred for semicircular canal dehiscence.
OTOLOGY & NEUROTOLOGY
(2022)
Article
Clinical Neurology
Mark Sakai, Daniel E. Killeen, Connie Ma, Mark Newcomer, Jacob B. Hunter, Brandon Isaacson, Joe Walter Kutz
Summary: This study aimed to assess the audiometric outcomes of endoscopic and microscopic ossiculoplasty. The results showed that endoscopic ossiculoplasty is associated with improved postoperative air-bone gap (ABG) compared with microscopic ossiculoplasty.
OTOLOGY & NEUROTOLOGY
(2022)
Article
Clinical Neurology
John P. Marinelli, Daniel E. Killeen, Zane Schnurman, Ashley M. Nassiri, Jacob B. Hunter, Katherine A. Lees, Christine M. Lohse, Thomas J. Roland, John G. Golfinos, Douglas Kondziolka, Michael J. Link, Matthew L. Carlson
Summary: Spontaneous volumetric tumor shrinkage during wait-and-scan management occurs more frequently than suggested by previous studies using linear tumor measurements and can even occur after previous episodes of documented tumor growth.
OTOLOGY & NEUROTOLOGY
(2022)
Article
Otorhinolaryngology
Daniel E. Killeen, John P. Marinelli, Christine M. Lohse, Katherine A. Lees, Michael J. Link, Matthew L. Carlson, Jacob B. Hunter
Summary: This study assessed the correlation between linear and volumetric changes in vestibular schwannomas (VS). Retrospective imaging review showed that changes in diameter were significantly correlated with changes in volume for both internal auditory canal (IAC) and cerebellopontine angle (CPA) tumors. However, diameter changes that did not meet the definition of linear growth (<2 mm) had corresponding median volume changes in excess of 20% for both IAC and CPA tumors.
OTOLARYNGOLOGY-HEAD AND NECK SURGERY
(2023)
Article
Clinical Neurology
R. L. Clarke, B. Isaacson, J. W. Kutz, Y. Xi, T. N. Booth
Summary: The study found that MRI can be used to diagnose imaging abnormalities related to sensorineural hearing loss in children. The measurements of the normal endolymphatic duct on MRI are similar to those on CT, and MRI showed high sensitivity and specificity in diagnosing an enlarged vestibular aqueduct.
AMERICAN JOURNAL OF NEURORADIOLOGY
(2021)
Article
Otorhinolaryngology
Donald Tan, Daniel E. Killeen, Joe Walter Kutz
Summary: The incidence of vestibular schwannoma has increased in recent decades, with treatment strategies shifting towards primary observation. The measurement of tumor volume is a new tool that is more sensitive than traditional methods, although its clinical implications are still being researched.
CURRENT OTORHINOLARYNGOLOGY REPORTS
(2021)