Pathology of the Facial Nerve

Stereotactic radiosurgery for facial nerve hemangioma: Case report and systematic review

BACKGROUND

Facial nerve hemangiomas (FNHs) are rare tumors that primarily occur near the geniculate ganglion in the temporal bone. Despite their rarity, they can cause significant facial nerve dysfunction. The optimal management approach for FNHs remains uncertain, with surgery being the mainstay but subject to debate regarding the extent of resection and preservation of the facial nerve.

METHODS

Systematic review was performed in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. We queried the PubMed/Medline (accessed on 5 March 2024) electronic database using combinations of the following search terms and words text: "geniculate ganglion hemangioma", "ganglional hemangioma", "hemangioma of the facial nerve", "facial hemangioma", and "intratemporal hemangioma".

RESULTS

We identified a total of 30 literatures (321 patients). The most common site involved for the facial nerve hemangioma was the geniculate ganglion area followed by internal auditory canal, tympanic segment, labyrinthine segment and mastoid involvement. All patients were treated with conservative management or surgery. We report a 48-year-old female patient with HB grade 2 facial palsy and hemifacial spasm underwent SRS using Cyberknife technology. The treatment targeted the FNH in the left internal acoustic canal near the geniculate ganglion. Six months post-treatment, clinical improvement was evident, and lesion control was confirmed in a follow-up brain MRI.

CONCLUSION

The rarity of FNHs contributes to the lack of consensus on optimal management. This illustrative case demonstrates the feasibility of SRS as a standalone treatment for FNHs.

Detailed Radiomorphometric Analysis of the Surgical Corridor for the Suprageniculate Approach

BACKGROUND

The suprageniculate fossa (SGF) is located between the geniculate ganglion, the middle cranial fossa (MCF) and the anterior semicircular canal (ASCC). An endoscopic transcanal approach has been recently proposed to treat the different lesions in this area. The aim of the study is to describe the anatomical pathway of this approach by measuring the dimensions of its boundaries while checking their correlation with the pneumatization of the SGF area.

METHODS

This is a retrospective anatomical analysis of Cone Beam CT scans of 80 patients, for a total of 160 temporal bones analyzed. Two checkpoints were measured for the SGF route, as an internal and an external window. These are triangles between the MCF dura, the geniculate ganglion and the ASCC on parasagittal and axial planes. The pneumatization of the SGF was also assessed, classified and correlated with the measured dimensions.

RESULTS

The depth of the SGF was 7.5 ± 1.8 mm. The width of the external window was 7.5 ± 1.9, 5.6 ± 2.4 and 1.6 ± 1.6 mm for the posterior, middle and anterior points of measurement, respectively. The height of the internal window was 7.6 ± 1.2, 4.5 ± 1.5 and 1.7 ± 1.7 mm for the posterior, middle and anterior points of measurement, respectively. Type A pneumatization was found in 87 cases, type B in 34 and type C in 39. The degree of pneumatization directly correlated to the depth and height of the fossa.

CONCLUSIONS

The suprageniculate approach route is defined by the internal and external windows which should be evaluated during a pre-surgery imaging assessment. The detailed anatomy of the approach and the novel classification of the pneumatization of the SGF are here described which may be useful to plan a safer procedure with minimal complications.

Oliveira F, Lavinsky J, Isolan G. Facial Nerve Hemangioma of the Lateral Portion of the Internal Acoustic Canal: A Case Report and a Review of Literature

Introduction  Facial nerve hemangiomas (FNH) are rare tumors. Although it can occur in any portion of the nerve, it predominantly appears near the geniculate ganglion. We present a case of facial nerve hemangioma of an unusual location. Case Report  A 30-year-old woman presented with right-sided severe hearing loss and progressive facial palsy. Magnetic resonance showed a 5 mm lesion in the lateral portion of the right internal auditory canal. Due to facial palsy, the patient was submitted to a translabyrinthine approach and a total tumor resection, followed by hypoglossal-facial nerve anastomosis. Discussion  The facial nerve is susceptible in its path to expansive lesions, which have high morbidity. FNH is a rare and difficult-to-diagnose lesion. Computerized tomography and nuclear magnetic resonance can be used in its diagnosis. The differential diagnosis of FNH includes, in addition to schwannomas, meningiomas, cholesteatomas, paragangliomas, and other temporal bone tumors. There is no well-established consensus on the best approach. Because of its slow growth and benign behavior, some studies suggest conservative treatment and serial imaging. However, surgery is the cornerstone of treatment, as it is the only curative option. Conclusion  FNHs are often small but very symptomatic. Its high morbidity demands early diagnosis and, sometimes, surgical treatment.

Imaging Anatomy and Pathology of the Intracranial and Intratemporal Facial Nerve

The facial nerve is one of the most complex cranial nerves, with motor, sensory, and parasympathetic fibers. A large spectrum of congenital, inflammatory, vascular, and neoplastic processes may affect one or more segments of the nerve. Customized use of computed tomography and magnetic resonance imaging combined with good understanding of the nerve anatomy and relevant clinical/surgical key points is crucial for appropriate assessment of facial neuropathy. This article reviews the anatomy of the intracranial and intratemporal facial nerve, and the imaging features of the most frequent disorders involving those segments of the nerve.

Main prognostic factors and physical therapy modalities associated with functional recovery in patients with peripheral facial paralysis

ABSTRACT Patients with peripheral facial paralysis (PFP) have some degree of recovery. The aim of this study was to evaluate prognostic factors and physical therapy modalities associated with functional recovery in patients with PFP. This is a cohort study with 33 patients. We collected the following variables of patients who underwent treatment at the rehabilitation center: age, sex, risk factors, affected side, degree of facial paralysis (House-Brackmann scale), start of rehabilitation, and therapy modality (kinesiotherapy only; kinesiotherapy with excitomotor electrotherapy; and kinesiotherapy with excitomotor electrotherapy and photobiomodulation therapy). The outcomes were: degree of facial movement (House-Brackmann) and face scale applied 90 days after treatment. Degree of PFP was associated with functional recovery (RR=0.51, 95% CI: 0.51-0.98; p=0.036). The facial movement was associated with the time to start rehabilitation (r=−0.37; p=0.033). Lower facial comfort was observed among women, worse ocular comfort was associated with diabetes mellitus, worse tear control with prior PFP, and worse social function with the degree of PFP. Our results indicate that the all modalities present in this study showed the same result in PFP. Recovery of PFP was associated with degree of nerve dysfunction, the length of time to onset of rehabilitation, female sex, hypertension, diabetes mellitus, and previous PFP, all of which were associated with worse outcomes on the face scale.

Evaluation and Management of Facial Nerve Schwannoma

Facial nerve schwannomas are benign peripheral nerve sheath tumors that arise from Schwann cells, and most commonly present with facial paresis and/or hearing loss. Computed tomography and MRI are critical to diagnosis. Management decisions are based on tumor size, facial function, and hearing status. Observation is usually the best option in patients with good facial function. For patients with poor facial function, the authors favor surgical resection with facial reanimation. There is growing evidence to support radiation treatment in patients with progressively worsening moderate facial paresis and growing tumors.

Surgical Management of Intrinsic Tumors of the Facial Nerve

BACKGROUND

Intrinsic tumors of the facial nerve are a rare entity. Dealing with this subset of tumors is challenging both in terms of decision making and surgical intervention.

OBJECTIVE

To review the outcomes of surgical management of facial nerve tumors and cable nerve graft interpositioning.

METHODS

A retrospective analysis was performed at a referral center for skull base pathology. One hundred fifteen patients who were surgically treated for facial nerve tumors were included. In case of nerve interruption during surgery, the cable nerve interpositioning technique was employed wherein the facial nerve palsy lasted for less than 1-yr duration. In cases of facial nerve palsy lasting for greater than 1 yr, the nerve was restituted by a hypoglossal facial coaptation.

RESULTS

Various degrees of progressive paralysis were seen in 84 (73%) cases. Sixty nine (60%) of the tumors involved multiple segments of the facial nerve. Sixty-two (53.9%) tumors involved the geniculate ganglion. Seventy four (64.3%) of the cases were schwannomas. Hearing preservation surgeries were performed in 60 (52.1%). Ninety one (79.1%) of the nerves that were sectioned in association with tumor removal were restituted primarily by interposition cable grafting. The mean preoperative House-Brackmann grading of the facial nerve was 3.6. The mean immediate postoperative grading was 5.4, which recovered to a mean of 3.4 at the end of 1 yr.

CONCLUSION

In patients with good facial nerve function (House-Brackmann grade I-II), a wait-and-scan approach is recommended. In cases where the facial nerve has been interrupted during surgery, the cable nerve interpositioning technique is a convenient and well-accepted procedure for immediate restitution of the nerve.

Magnetic resonance image manifestations of the atypical meningioma

Through retrospective analysis of 13 cases of magnetic resonance image (MRI) manifestations of atypical meningiomas confirmed by operation and pathology in the First Affiliated Hospital of Xinxiang Medical University, the objective of this study was to evaluate the diagnostic value of MRI in order to improve the accuracy rate of preoperative diagnosis. In this retrospective analysis of MRI findings for atypical meningiomas in First Affiliated Hospital of Xinxiang Medical University from January to July in 2012, the location, morphology and tumor signals and other tumor imaging characteristics were covered. In 13 cases of atypical meningioma patients of this group, most tumors were located at typical sites (10/13), mainly the falx cerebri, parasagittal, convexity, saddle area. Only two cases were at atypical locations, 1 in the cerebellar hemisphere and 1 in a lateral ventricle. Most of the tumors showed T1 and T2 isointensity signals, and necrosis, calcification, and peritumoral edema were always featured. DWI showed isointensity in 11 cases (11/13), and hyperintensity in 2. Some 9 cases had dural tail signs, 12 had accurate positioning (12/13), and 2 were postoperative recurrences. MRI has high value in the diagnosis of atypical meningiomas, with important roles in early clinical diagnosis, treatment and prognosis evaluation.

Peripheral facial palsy in children

The aim of this study is to evaluate the types and clinical characteristics of peripheral facial palsy in children. The hospital charts of children diagnosed with peripheral facial palsy were reviewed retrospectively. A total of 81 children (42 female and 39 male) with a mean age of 9.2 ± 4.3 years were included in the study. Causes of facial palsy were 65 (80.2%) idiopathic (Bell palsy) facial palsy, 9 (11.1%) otitis media/mastoiditis, and tumor, trauma, congenital facial palsy, chickenpox, Melkersson-Rosenthal syndrome, enlarged lymph nodes, and familial Mediterranean fever (each 1; 1.2%). Five (6.1%) patients had recurrent attacks. In patients with Bell palsy, female/male and right/left ratios were 36/29 and 35/30, respectively. Of them, 31 (47.7%) had a history of preceding infection. The overall rate of complete recovery was 98.4%. A wide variety of disorders can present with peripheral facial palsy in children. Therefore, careful investigation and differential diagnosis is essential.

Imaging spectrum of facial nerve lesions

The facial nerve is affected by a wide variety of pathologies, including congenital, traumatic, inflammatory, and neoplastic conditions. Imaging plays a vital role in the diagnosis of these pathologies. The facial nerve has a complex anatomy and course. A strong grasp of normal facial nerve anatomy is essential for the radiologist to maintain a high level of diagnostic sensitivity. This article details the normal imaging anatomy of the facial nerve and the imaging features of common facial nerve pathologies.

Meningioma of geniculate ganglion: case report and review of the literature

Although meningioma is a frequent intracranial tumor, it rarely affects the geniculate ganglion of the facial nerve. Facial palsy is the most common symptom. When hearing is preserved (class A or B, AAO-HNS), tumor is best removed through a middle cranial fossa approach. We report the case of a geniculate ganglion meningioma and present its clinical, radiological, and pathological features. Surgical management is discussed. A literature review revealed that only 17 previous cases have been reported during the last 50 years.

Mastigação, deglutição e suas adaptações na paralisia facial periférica

OBJETIVO: caracterizar mastigação, fase oral da deglutição e possíveis adaptações funcionais observadas nos portadores de Paralisia Facial Periférica. MÉTODO: participaram desta pesquisa 30 indivíduos com Paralisia Facial Periférica grau IV, com história de até 30 dias, sem distinção de etiologia e divididos em três grupos, os que apresentavam a paralisia em até 10 dias, de 11 a 20 e de 20 a 30 dias. As funções mastigação e fase oral da deglutição foram avaliadas tanto com alimento sólido e como com água natural. Os indivíduos responderam questões relacionadas às dificuldades imediatamente após a instalação da paralisia. Os dados foram analisados estatisticamente pelo Teste da Razão de Verossimilhança e pelo Teste Exato de Fisher. RESULTADOS: foram constatadas alterações nas funções de mastigação e fase oral da deglutição pela diminuição do tônus no músculo orbicular dos lábios e do músculo bucinador, que diminuindo a pressão intra-oral, favorece o escape de alimento e líquido. À observação da Fonoaudióloga a variável "derrama líquido enquanto bebe" apresentou dados estatisticamente significante (p=0,003) nos três grupos estudados. A variável "acúmulo de alimento entre os dentes e a gengiva no lado paralisado" foi estatisticamente significante nos grupos de 11 a 20 dias (p= 0,002). CONCLUSÃO: os indivíduos da amostra mastigam no lado paralisado com dificuldade, mediante ciclos mastigatórios lentos e inconsistentes. Ocorre um incremento nos movimentos de língua para limpeza de resíduos retidos no vestíbulo oral no lado paralisado. Este é o sintoma que mais incomoda o paciente. Apresentam dificuldade no beber de forma contínua. Desenvolvem adaptações para compensar suas dificuldades funcionais.

Infranuclear facial palsy: importance of imaging the geniculate fossa

OBJECTIVE

To highlight the importance of imaging the geniculate fossa in patients with solitary infranuclear facial palsy.

STUDY DESIGN

Prospective.

SETTING

Tertiary referral center.

ELIGIBILITY CRITERIA

Patients with solitary infranuclear facial palsy sent for imaging.

INTERVENTION

Diagnostic.

MAIN OUTCOME MEASURE

Imaging specifics concerning high-resolution computed tomography (HRCT) and magnetic resonance imaging (MRI) are described in detail for evaluation of the intratemporal part of the facial nerve with special focus on the geniculate fossa.

RESULTS

Normal appearances of the geniculate fossa on HRCT and MRI and its normal anatomic variant, that is, dehiscence of the overlying bone are described. Imaging findings in a range of pathologies involving the geniculate fossa in a clinical setting of infranuclear facial nerve palsy is demonstrated. These include infections (tuberculosis), trauma, schwannoma, hemangioma, meningioma, and perineural spread of parotid malignancy.

CONCLUSION

The geniculate fossa is a small bony hiatus in the temporal bone and is situated at the junction of the labyrinthine and the tympanic segments of the intratemporal facial nerve canal. It houses important neural structures and is best visualized by a combination of HRCT and high-resolution MRI examination of the temporal bone. It is therefore imperative for imaging specialists to be familiar with the normal appearance of this structure on HRCT and MRI examinations of the temporal bone as subtle imaging findings involving the geniculate fossa can be indicators of a variety of abnormalities.

Medium term outcome in Bell's palsy in children

OBJECTIVE

Bell's palsy is a non-life threatening disorder with important functional and psychosocial effects. While recent research has shown significant benefit from treatment with steroids in adults, there have been no conclusive studies demonstrating benefit in children. This study set out to explore the medium term resolution of symptoms in Bell's palsy presenting to the emergency department (ED).

PATIENTS AND METHODS

This was a retrospective cohort study of children attending an Irish paediatric ED with a diagnosis of Bell's palsy. Patients were identified via the ED database. The primary outcome measure was resolution at follow-up call (6-18 months after presentation). Secondary outcome measures were ED treatment, imaging and time to resolution of symptoms.

RESULTS

There were 48 presentations, involving 45 patients. Left and right-sided palsies were equally represented. Of these, 16 (33%) received prednisolone. MRI was performed in five cases (10%), four were normal and one did not change management. In follow-up telephone contact, of 35 presentations, 28 (80%, 95% CI 63% to 91%) had complete resolution, six (17%, 95% CI 7% to 34%) partial resolution to variable degrees and one patient showed no improvement. Of the 13 patients who had received prednisolone, nine (69%, 95% CI 39% to 91%) had complete resolution; of the 22 patients who were not treated with prednisolone 19 (86%, 95% CI 65% to 97%) had complete resolution (p=0.22).

CONCLUSIONS

The majority of children with Bell's palsy have complete resolution of the facial weakness. Steroid use is highly variable and warrants a placebo controlled randomised trial.

Modern concepts in facial nerve reconstruction

Background

Reconstructive surgery of the facial nerve is not daily routine for most head and neck surgeons. The published experience on strategies to ensure optimal functional results for the patients are based on small case series with a large variety of surgical techniques. On this background it is worthwhile to develop a standardized approach for diagnosis and treatment of patients asking for facial rehabilitation.

Conclusion

A standardized approach is feasible: Patients with chronic facial palsy first need an exact classification of the palsy's aetiology. A step-by-step clinical examination, if necessary MRI imaging and electromyographic examination allow a classification of the palsy's aetiology as well as the determination of the severity of the palsy and the functional deficits. Considering the patient's desire, age and life expectancy, an individual surgical concept is applicable using three main approaches: a) early extratemporal reconstruction, b) early reconstruction of proximal lesions if extratemporal reconstruction is not possible, c) late reconstruction or in cases of congenital palsy. Twelve to 24 months after the last step of surgical reconstruction a standardized evaluation of the therapeutic results is recommended to evaluate the necessity for adjuvant surgical procedures or other adjuvant procedures, e.g. botulinum toxin application. Up to now controlled trials on the value of physiotherapy and other adjuvant measures are missing to give recommendation for optimal application of adjuvant therapies.

Facial nerve palsy: etiology and approach to diagnosis and treatment

Facial nerve palsy has a broad differential diagnosis and possible psychological and anatomical consequences. A thorough investigation must be performed to determine the cause of the palsy and to direct treatment. If no cause can be found, therapy with prednisone with or without an antiviral medication can be considered and begun as early as possible after onset of symptoms. Resolution and time to recovery vary with etiology, but overall prognosis is good.

[Cranial nerves - spectrum of inflammatory and tumorous changes]

Inflammatory processes as well as primary and secondary tumorous changes may involve cranial nerves causing neurological deficits. In addition to neurologists, ENT physicians, ophthalmologists and maxillofacial surgeons, radiologists play an important role in the investigation of patients with cranial nerve symptoms. Multidetector computed tomography (MDCT) and particularly magnetic resonance imaging (MRI) allow the depiction of the cranial nerve anatomy and pathological neural changes. This article briefly describes the imaging techniques in MDCT and MRI and is dedicated to the radiological presentation of inflammatory and tumorous cranial nerve pathologies.

Avaliação de um protocolo da reabilitação orofacial na paralisia facial periférica: evaluation of an orofacial rehabilitation protocol

OBJETIVO: avaliar o protocolo proposto de reabilitação neuromuscular orofacial para paralisia facial periférica. MÉTODOS: observação clínica de 20 pacientes com paralisia grau IV, encaminhados para reabilitação orofacial no Ambulatório de Paralisia Facial do Hospital de Clínicas da Unicamp: estudo longitudinal prospectivo. A constatação da evolução funcional ou não, na reabilitação, baseou-se na melhora do tônus muscular, cuja variação foi aferida mediante modificação no ângulo da comissura labial. O estudo se fez sob imagens da documentação fotográfica pré (após quinze dias de instalação da paralisia facial) e pós-tratamento de um ano. Para comprovação da eficácia da reabilitação, mediu-se o ângulo da comissura labial pré e pós-reabilitação. O grupo estudado foi comparado a um grupo controle composto de nove sujeitos com paralisia facial grau IV, não submetidos à reabilitação orofacial. Os dados foram analisados estatisticamente pelo teste emparelhado das amostras (T-Student). RESULTADOS: a média de redução do ângulo da comissura labial, com o tratamento, foi de 7,9º, estatisticamente significantes (p<0.001). Para o grupo controle a média das medidas angulares foi de 100.9º + 1.9. Esse valor não diferencia dos medidos inicialmente no grupo estudado (p=0,723). Foram significantemente mais altos quando comparados à média dos valores angulares finais do grupo estudado com pacientes tratados (p=0.001). CONCLUSÃO: o protocolo de reabilitação empregado nesta amostra promoveu incremento marcante do tônus muscular, com melhora no repouso facial.