scholarly journals Comparison of Diffusion-Weighted MRI Reconstruction Methods for Visualization of Cranial Nerves in Posterior Fossa Surgery

2017 ◽  
Vol 11 ◽  
Author(s):  
Brendan Behan ◽  
David Q. Chen ◽  
Francesco Sammartino ◽  
Danielle D. DeSouza ◽  
Erika Wharton-Shukster ◽  
...  
Keyword(s):  
Posterior Fossa ◽  
Cranial Nerves ◽  
Posterior Fossa Surgery ◽  
Diffusion Weighted Mri ◽  
Diffusion Weighted ◽  
Reconstruction Methods ◽  
Mri Reconstruction

scholarly journals RUN‐UP: Accelerated multishot diffusion‐weighted MRI reconstruction using an unrolled network with U‐Net as priors

2020 ◽  
Vol 85 (2) ◽  
pp. 709-720 ◽  
Author(s):  
Yuxin Hu ◽  
Yunyingying Xu ◽  
Qiyuan Tian ◽  
Feiyu Chen ◽  
Xinwei Shi ◽  
...  
Keyword(s):  
Diffusion Weighted Mri ◽  
Diffusion Weighted ◽  
Mri Reconstruction ◽  
Run Up

Mutism after posterior fossa surgery in children

1990 ◽  
Vol 72 (6) ◽  
pp. 959-963 ◽  
Author(s):  
Luigi Ferrante ◽  
Luciano Mastronardi ◽  
Michele Acqui ◽  
Aldo Fortuna
Keyword(s):  
Posterior Fossa ◽  
Fourth Ventricle ◽  
Cranial Nerves ◽  
Speech Disorder ◽  
Posterior Fossa Surgery ◽  
Content Type ◽  
Disturbance Of Consciousness ◽  
Lower Cranial Nerves ◽  
Fine Print

✓ Three patients aged 5½ to 9 years old with mutism after posterior fossa surgery are presented. The entity is discussed with a review of 15 additional previously reported cases in children aged 2 to 11 years. In all 18 patients, a large midline tumor of the posterior fossa (medulloblastoma in nine cases, astrocytoma in five, and ependymoma in four), often attached to one or both lateral recesses of the fourth ventricle, was removed. Mutism developed 18 to 72 hours after the operation (mean 41.5 hours) in patients with no disturbance of consciousness and no deficits of the lower cranial nerves or of the organs of phonation. All of these children had spoken in the first hours after surgery. The disorder lasted from 3 to 16 weeks (mean 7.9 weeks). Speech was regained after a period of dysarthria in six of the 10 cases for whom this information was available. The various hypotheses advanced to explain the pathogenesis of this speech disorder are analyzed.

scholarly journals Multi‐shot diffusion‐weighted MRI reconstruction with magnitude‐based spatial‐angular locally low‐rank regularization (SPA‐LLR)

2019 ◽  
Vol 83 (5) ◽  
pp. 1596-1607 ◽  
Author(s):  
Yuxin Hu ◽  
Xiaole Wang ◽  
Qiyuan Tian ◽  
Grant Yang ◽  
Bruce Daniel ◽  
...  
Keyword(s):  
Low Rank ◽  
Diffusion Weighted Mri ◽  
Diffusion Weighted ◽  
Mri Reconstruction

Adjunctive Use of Endoscopy during Posterior Fossa Surgery to Treat Cranial Neuropathies

Neurosurgery ◽  
2001 ◽  
Vol 49 (1) ◽  
pp. 108-116 ◽  
Author(s):  
Wesley A. King ◽  
Phillip A. Wackym ◽  
Chandranath Sen ◽  
Glenn A. Meyer ◽  
John Shiau ◽  
...  
Keyword(s):  
Posterior Fossa ◽  
Microvascular Decompression ◽  
Cranial Nerves ◽  
Internal Auditory Canal ◽  
Vascular Compression ◽  
Posterior Fossa Surgery ◽  
Suboccipital Craniotomy ◽  
Neoplastic Processes ◽  
Rigid Endoscope ◽  
Cranial Neuropathies

Abstract OBJECTIVE The objective of this study was to determine the utility and safety of rigid endoscopy as an adjunct during posterior fossa surgery to treat cranial neuropathies. METHODS A suboccipital craniotomy was performed for 19 patients with non-neoplastic processes involving the Vth, VIIth, and/or VIIIth cranial nerves. Ten patients with trigeminal neuralgia (n = 8), hemifacial spasm (n = 1), or intractable tinnitus (n = 1) underwent primarily microvascular decompression procedures. One patient with geniculate neuralgia underwent nervus intermedius sectioning combined with microvascular decompression. Eight patients underwent unilateral vestibular nerve neurectomies for treatment of Ménière's disease. A 0- or 30-degree rigid endoscope was used in conjunction with the standard microscopic approach for all procedures. RESULTS All patients experienced resolution or significant improvement of their preoperative symptoms after posterior fossa surgery. The endoscope allowed improved definition of anatomic neurovascular relationships without the need for significant cerebellar or brainstem retraction. Cleavage planes between the cochlear and vestibular nerves entering the internal auditory canal and sites of vascular compression could not be microscopically observed for several patients; however, endoscopic identification was possible for all patients. There were no complications related to the use of the endoscope. CONCLUSION The rigid endoscope can be used safely during posterior fossa surgery to treat cranial neuropathies, and it allows improved observation of the cranial nerves, nerve cleavage planes, and vascular anatomic features without significant cerebellar or brainstem retraction.

Posterior Fossa

2019 ◽  
Author(s):  
Talia S. Vogel ◽  
Penny P. Liu
Keyword(s):  
Posterior Fossa ◽  
Preoperative Evaluation ◽  
Cranial Nerves ◽  
Air Embolism ◽  
Neurophysiological Monitoring ◽  
Posterior Fossa Surgery ◽  
Neurophysiologic Monitoring ◽  
Venous Air Embolism ◽  
Brainstem Stroke ◽  
Air Embolus

The posterior fossa houses essential brainstem nuclei, cranial nerves, cerebral vasculature, and mechanisms for cerebrospinal fluid drainage. Anesthetic considerations for posterior fossa surgery include thorough preoperative evaluation, intraoperative monitoring, and anesthetic planning to allow neurophysiological monitoring. Careful positioning is imperative to optimize surgical conditions and to risk stratify patients for complications, including venous air embolus. Venous air embolus is a common complication of posterior fossa surgery given the plentitude of venous channels in the posterior fossa, and rapid recognition is key to managing this complication.  Posterior fossa surgery also has a number of other known complications including postoperative apnea, prolonged ventilation, and possible brainstem stroke.  This review contains 4 tables, 1 video, and 31 references. Keywords: Posterior fossa surgery, Brainstem surgery, Neuroanesthesiology, Venous air embolism/embolus, Sitting craniotomy, Prone craniotomy, Transesophageal echocardiogram, Neurophysiologic monitoring

scholarly journals Electrophysiological Monitoring During Acoustic Neuroma and Other Posterior Fossa Surgery

1988 ◽  
Vol 15 (1) ◽  
pp. 73-81 ◽  
Author(s):  
R.D. Linden ◽  
C.H. Tator ◽  
C. Benedict ◽  
D. Charles ◽  
V. Mraz ◽  
...  
Keyword(s):  
Facial Nerve ◽  
Real Time ◽  
Posterior Fossa ◽  
Acoustic Neuroma ◽  
Auditory Nerve ◽  
Cranial Nerves ◽  
Intracranial Stimulation ◽  
Electromyographic Activity ◽  
Posterior Fossa Surgery ◽  
Brainstem Response

ABSTRACT:Techniques used to monitor the function of the seventh and eighth cranial nerves during acoustic neuroma and other posterior fossa surgery are reviewed. The auditory brainstem response (ABR), electrocochleogram (ECochG) and direct recording from the auditory nerve (CNAP) were compared. The best technique is the ECochG, although in many cases, the CNAP should be used as a back-up technique. The CNAP is especially useful for the identification of the auditory nerve. Both can provide real-time feedback on the physiological integrity of the auditory nerve. The ABR may be helpful in monitoring brainstem function. For some procedures, optimal monitoring requires the combined recording of all three techniques.Monopolar constant-voltage intracranial stimulation of the facial nerve is helpful for the identification and preservation of the facial nerve. Audio monitoring of spontaneous electromyographic activity provides real-time feedback on the effect of surgical manipulation of the nerve. Monitoring of ephaptic transmission in the facial nerve during microvascular decompression for hemifacial spasm aids in the identification of the offending vessel.

Sign in / Sign up

Export Citation Format

Share Document