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Cerebellopontine angle

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https://www.readbyqxmd.com/read/28049034/hypervascular-lesions-of-the-cerebellopontine-angle-the-relevance-of-angiography-as-a-diagnostic-and-therapeutic-tool-and-the-role-of-stereotactic-radiosurgery-in-management-a-comprehensive-review
#1
REVIEW
Yosef Laviv, Ajith Thomas, Ekkehard M Kasper
The cerebellopontine angle (CPA) is a narrowed skull base area, containing important cranial nerves and vessels and bordering with eloquent areas of the posterior fossa. Tumors of the CPA are a heterogeneous group and can arise extradural, intradural-extraaxial or intraaxial. Accordingly, their vascular supply changes, depending on their anatomical origin. Symptomatic, large CPA tumors require surgical resection in order to prevent irreversible, severe neurological damages. However, its tight and strategical location make surgery in the CPA very challenging and require appropriate pre-surgical planning...
December 31, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/28042016/spontaneous-intraventricular-hemorrhage-a-rare-presentation-of-a-skull-base-mesenchymal-chondrosarcoma
#2
Altaf Ali Laghari, Gohar Javed, Muhammad Faheem Khan, Syed Ijlal Ahmed, Karim Rizwan Nathani, Riyasat Ahmed
INTRODUCTION: Chondrosarcomas (CSA) are very rare malignant slow growing tumors which develop in or near the petroclival region of the brain. We report our experience of a very rare case in which the tumor originated from left petrous bone and induced intraventricular hemorrhage (IVH) leading to an acute comatose presentation. CASE DESCRIPTION: A 28 year old male initially presented in outpatient department (OPD) with a 1 month history of headache, vomiting, vertigo and left facial numbness...
December 29, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/28013334/cerebellopontine-angle-medulloblastoma-with-extensive-nodularity-in-a-child-case-report-and-review-of-the-literature
#3
Raywat Noiphithak, Vich Yindeedej, Chatchai Thamwongskul
BACKGROUND: Cerebellar medulloblastomas (MBs) are one of the most common posterior fossa tumors in children but rarely occur in the cerebellopontine angle (CPA). Only 39 cases of CPA MBs were reported in the literature, and most of them were classic and desmoplastic MBs. CASE PRESENTATION: A 22-month-old girl presented with progressive cerebellar ataxia. Magnetic resonance imaging showed a large tumor in the right CPA and obstructive hydrocephalus. Surgical resection was performed and achieved total tumor removal...
December 24, 2016: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/27999709/-microsurgical-approach-to-the-ambient-cistern
#4
Pablo Ajler, Michael Cruz Bravo, Lucas Garategui, Ezequiel Goldschmidt, Gustavo Isolan, Álvaro Campero
OBJECTIVE: To describe a step-by-step approach to the ambient cistern by the suboccipital retrosigmoid supracerebellar infratentorial (RSI) approach. DESCRIPTION: The RSI approach is performed in the same manner as the suboccipital retrosigmoid approach, usually used to access the pathology of the cerebellopontine angle, with the following modifications: (1) we always use the semi-sitting position, (2) the craniotomy-craniectomy must expose the transverse sinus and extend 5 cm medially to the inion, (3) when performing the dural opening it is necessary to mobilize the dura with the transverse sinus upwards, (4) under magnification with surgical microscope the cerebellomedullary cistern should be opened in order to drain cerebrospinal fluid for relaxing the cerebellum, and (5) arachnoidal adherences and bridging veins must be coagulated and cut if necessary...
2016: Surgical Neurology International
https://www.readbyqxmd.com/read/27958603/a-connection-between-neurovascular-conflicts-within-the-cerebellopontine-angle-and-vestibular-neuritis-a-case-controlled-cohort-study
#5
B Loader, I Linauer, S Korkesch, I Krammer-Effenberger, V Zielinski, N Schibany, A Kaider, E Vyskocil, D Tscholakoff, P Franz
This retrospective, observer blinded case-control study aims to compare the prevalence of neurovascular conflicts (NVCs) of the vestibulocochlear nerve and the anterior inferior cerebellar artery (AICA) in patients presenting with clinical signs of acute vestibular neuritis with and without subsequent objective vestibular function loss (VFL). 58 acute cases of clinically suspected acute vestibular neuritis were investigated with same day cranial MRI at a tertiary referral centre and compared to 61 asymptomatic controls...
October 2016: Acta Otorhinolaryngologica Italica
https://www.readbyqxmd.com/read/27935543/acoustic-neuroma-as-first-sign-of-inner-ear-functional-disorders
#6
Marzena Bielińska, Kalina Owczarek, Joanna Nowosielska-Grygiel, Jurek Olszewski, Piotr Pietkiewicz
INTRODUCTION: The aim of this work was to describe acoustic neuromas as the first signs of inner ear functional disorders. MATERIAL AND METHODS: The study covered 3,456 audiological and otoneurological patients, who were treated in the Department of Otolaryngology, Laryngological Oncology, Audiology and Phoniatrics Military Medical Academy University Teaching Hospital in Lodz within the period of 2011-2016. Among the studied subjects, an acoustic neuroma on the vestibulocochlear nerve was diagnosed in 13 cases (5,16%), including 9 women and 4 men...
October 31, 2016: Otolaryngologia Polska. the Polish Otolaryngology
https://www.readbyqxmd.com/read/27933249/an-enterogenous-cyst-with-atypical-pathological-findings-and-chemical-meningitis
#7
Lu Wang, Xiaona Chang, Chao Fu, Weidong Yu, Xiaoxuan Fang
INTRODUCTION: Intracranial enterogenous cysts are rare and mainly occur in the posterior fossa. These cysts are usually extra-axial, midline, anterior to the brainstem, or at the cerebellopontine angle. We report a case of an enterogenous cyst in which diagnosis was difficult because the lesion showed atypical pathologic findings. CASE PRESENTATION: A healthy 41-year-old man complained of paroxysmal occipital headaches lasting over a week, with increased severity for 3 days accompanied by slight dizziness and mild nausea...
2016: SpringerPlus
https://www.readbyqxmd.com/read/27932747/-a-rare-case-of-metastatic-brain-tumors-in-the-bilateral-cerebellopontine-angles
#8
Yasuhiro Node, Naoyuki Harada, Hiroyuki Masuda, Kosuke Kondo, Masaaki Nemoto, Nobuo Sugo
We encountered a rare case of metastatic brain tumors in the bilateral cerebellopontine angles. The patient was a 61-year-old man, who visited an otorhinolaryngology clinic with complaints of rapidly progressing bilateral hearing impairment and facial palsy. The patient was referred to our hospital because tumorous lesions were suspected in the bilateral cerebellopontine angles on brain magnetic resonance imaging. Regarding tumor markers, the patient's cancer antigen 19-9 and carcinoembryonic antigen levels were high, which suggested metastasis...
December 2016: No Shinkei Geka. Neurological Surgery
https://www.readbyqxmd.com/read/27929602/facial-reanimation-according-to-the-postresection-defect-during-lateral-skull-base-surgery
#9
John P Leonetti, Sahar Nadimi, Sam J Marzo, Douglas Anderson, Darl Vandevender
The vast majority of benign tumors of the cerebellopontine angle, temporal bone, and parotid gland can be successfully resected without permanent injury to the facial nerve. Malignant tumors or recurrent disease may require facial nerve sacrifice, especially if preoperative facial paresis is present. This article will present case examples of the various methods to reconstruct facial animation after lateral skull base resections that require sacrifice of cranial nerve VII, and the associated mimetic facial musculature...
December 2016: Ear, Nose, & Throat Journal
https://www.readbyqxmd.com/read/27913261/typical-symptoms-of-normal-pressure-hydrocephalus-caused-by-choroid-plexus-papilloma-in-the-cerebellopontine-angle
#10
Hiroshi Ito, Yukiko Nakahara, Masatou Kawashima, Jun Masuoka, Tatsuya Abe, Toshio Matsushima
BACKGROUND: Choroid plexus papillomas (CPPs) are rare benign intracranial tumors. We report a rare case of CPP manifesting with typical symptoms of normal-pressure hydrocephalus rather than obstructive hydrocephalus. CASE DESCRIPTION: A 45-year-old woman presented with a 6-year history of headache and typical symptoms of normal-pressure hydrocephalus, including gait disturbance, urinary incontinence, and cognitive dysfunction, in addition to the more common symptoms of CPP, such as lower cranial nerve dysfunctions and ataxia...
November 29, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/27898606/facial-nerve-meningioma-a-cause-of-pediatric-facial-weakness
#11
Nicholas L Deep, Sharon H Gnagi, David F Carpentieri, P David Adelson, Peter A Weisskopf
OBJECTIVE: To present an unusual case of a temporal bone meningioma with intrafascicular spread throughout the temporal facial nerve from cerebellopontine angle (CPA) to stylomastoid foramen. PATIENT: Four-year-old female with progressive facial weakness and normal hearing. MAIN OUTCOME MEASURE: Clinical, radiological, and histopathological findings of temporal bone meningiomas. RESULTS: A patient presented with progressive facial weakness and normal hearing...
November 24, 2016: Otology & Neurotology
https://www.readbyqxmd.com/read/27897128/defining-the-limits-of-endoscopic-access-to-internal-auditory-canal
#12
Adam Master, Mickie Hamiter, Maura Cosetti
OBJECTIVE: To quantify surgical access to the internal auditory canal (IAC) using an exclusively endoscopic transcanal approach (EETA) and investigate surgically relevant relationships with neurovascular and osseous landmarks of the temporal bone. MATERIALS AND METHODS: Anatomical dissection of two paired temporal bones and 15 unpaired temporal bones was performed using an exclusively endoscopic approach to IAC. The dissection proceeded until the cerebellopontine angle (CPA) could be accessed...
November 28, 2016: Journal of International Advanced Otology
https://www.readbyqxmd.com/read/27871453/chasing-dizzy-chimera-diagnosis-of-combined-peripheral-and-central-vestibulopathy
#13
Seo-Young Choi, Hyo-Jung Kim, Ji-Soo Kim
Diagnosis of combined peripheral and central vestibulopathy remains a challenge since the findings from peripheral vestibular involvements may overshadow those from central vestibular disorders or vice versa. The aim of this study was to enhance detection of these intriguing disorders by characterizing the clinical features and underlying etiologies. We had recruited 55 patients with combined peripheral and central vestibulopathy at the Dizziness Clinic of Seoul National University Bundang Hospital from 2003 to 2013...
December 15, 2016: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/27857811/primary-choroid-plexus-papilloma-of-cerebellopontine-angle-an-unusual-entity-in-infancy
#14
Ankur Kapoor, Ashish Aggarwal, Chirag K Ahuja, Pravin Salunke
No abstract text is available yet for this article.
July 2016: Journal of Pediatric Neurosciences
https://www.readbyqxmd.com/read/27836701/synchronous-tumors-of-the-cerebellopontine-angle
#15
Christopher S Graffeo, Avital Perry, William R Copeland, Caterina Giannini, Brian A Neff, Colin L W Driscoll, Michael J Link
BACKGROUND: Synchronous tumors of the cerebellopontine angle (CPA) are exceedingly rare, and inconsistently described. We report two cases of contiguous vestibular schwannoma (VS) and meningioma, and perform a systematic literature review of all multiple CPA tumors. METHODS: Retrospective chart review and systematic literature review RESULTS: A 64-year-old woman and a 42-year-old man presented with symptoms referable to the CPA. MR imaging in both revealed two separate contiguous tumors...
November 8, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/27832380/endoscopic-approach-routes-in-the-posterior-fossa-cisterns-through-the-retrosigmoid-keyhole-craniotomy-an-anatomical-study
#16
Peter Kurucz, Gabor Baksa, Lajos Patonay, Firas Thaher, Michael Buchfelder, Oliver Ganslandt
Endoscopy in cerebellopontine angle surgery is an increasingly used technique. Despite of its advantages, the shortcomings arising from the complex anatomy of the posterior fossa are still preventing its widespread use. To overcome these drawbacks, the goal of this study was to define the anatomy of different endoscopic approaches through the retrosigmoid craniotomy and their limitations by surgical windows. Anatomical dissections were performed on 25 fresh human cadavers to describe the main approach-routes...
November 10, 2016: Neurosurgical Review
https://www.readbyqxmd.com/read/27791522/tonsillobiventral-fissure-approach-to-the-lateral-recess-of-the-fourth-ventricle
#17
Ali Tayebi Meybodi, Michael T Lawton, Halima Tabani, Arnau Benet
OBJECTIVE Surgical access to the lateral recess of the fourth ventricle (LR) is suboptimal with existing transvermian and telovelar approaches because of limited lateral exposure, significant retraction of the cerebellar tonsil, and steep trajectories near brainstem perforator arteries. The goal in this study was to assess surgical exposure of the tonsillobiventral fissure approach to the LR, and to describe the relevant anatomy. METHODS Two formaldehyde-fixed cerebella were used to study the anatomical relationships of the LR...
October 28, 2016: Journal of Neurosurgery
https://www.readbyqxmd.com/read/27791521/perpetuation-of-errors-in-illustrations-of-cranial-nerve-anatomy
#18
C Eduardo Corrales, Albert Mudry, Robert K Jackler
For more than 230 years, anatomical illustrations have faithfully reproduced the German medical student Thomas Soemmerring's cranial nerve (CN) arrangement. Virtually all contemporary atlases show the abducens, facial, and vestibulocochlear nerves (CNs VI-VIII) all emerging from the pontomedullary groove, as originally depicted by Soemmerring in 1778. Direct observation at microsurgery of the cerebellopontine angle reveals that CN VII emerges caudal to the CN VIII root from the lower lateral pons rather than the pontomedullary groove...
October 28, 2016: Journal of Neurosurgery
https://www.readbyqxmd.com/read/27787647/pediatric-intracranial-clear-cell-meningioma-a-clinicopathological-study-of-seven-cases-and-literature-review
#19
Hao Li, Meng Zhao, Yuming Jiao, Zhicen Li, Ji Ma, Shuo Wang, Yong Cao, Jizong Zhao
BACKGROUND: In this study, we reported seven cases of pediatric intracranial clear cell meningiomas (CCMs) in our institution and reviewed the relevant literature to investigate the clinicopathological characteristics, treatment options, and prognosis of these rare tumors. METHODS: From January 2005 to June 2016, we retrospectively reviewed seven pediatric intracranial CCMs in terms of their clinical data, preoperative MRI features, and prognosis. Moreover, a critical review of the English language literature was also conducted...
October 27, 2016: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/27779560/cost-analysis-of-cerebrospinal-fluid-leaks-and-cerebrospinal-fluid-leak-prevention-in-patients-undergoing-cerebellopontine-angle-surgery
#20
Alexander Chern, Jacob B Hunter, Marc L Bennett
OBJECTIVE: To determine if cranioplasty techniques following translabyrinthine approaches to the cerebellopontine angle are cost-effective. STUDY DESIGN: Retrospective case series. PATIENTS: One hundred eighty patients with available financial data who underwent translabyrinthine approaches at a single academic referral center between 2005 and 2015. INTERVENTION: Cranioplasty with a dural substitute, layered fat graft, and a resorbable mesh plate secured with screws Main Outcome Measures: billing data was obtained for each patient's hospital course for translabyrinthine approaches and postoperative cerebrospinal fluid (CSF) leaks...
January 2017: Otology & Neurotology
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