scholarly journals Caloric testing in patients with heavy or light cupula of the lateral semicircular canal

2016 ◽  
Vol 1 (6) ◽  
pp. 163-168 ◽  
Author(s):  
Hiroaki Ichijo
Keyword(s):  
Semicircular Canal ◽  
Lateral Semicircular Canal ◽  
Caloric Testing ◽  
Light Cupula

scholarly journals Intractable Persistent Direction-Changing Geotropic Nystagmus Improved by Lateral Semicircular Canal Plugging

2015 ◽  
Vol 2015 ◽  
pp. 1-3 ◽  
Author(s):  
Toru Seo ◽  
Kazuya Saito ◽  
Katsumi Doi
Keyword(s):  
Hearing Loss ◽  
Supine Position ◽  
Semicircular Canal ◽  
Sudden Hearing Loss ◽  
Neutral Point ◽  
Positional Nystagmus ◽  
Lateral Semicircular Canal ◽  
Positional Vertigo ◽  
Light Cupula ◽  
The Right

Antigravitational deviation of the cupula of the lateral semicircular canal, which is also called light cupula, evokes persistent direction-changing geotropic nystagmus with a neutral point. No intractable cases of this condition have been reported. In our case, a 67-year-old man complained of positional vertigo 3 months after developing idiopathic sudden hearing loss in the right ear with vertigo. He showed a persistent direction-changing geotropic nystagmus with a leftward beating nystagmus in the supine position. The nystagmus resolved when his head was turned approximately 30° to the right. He was diagnosed with light cupula of the right lateral semicircular canal and was subsequently treated with an antivertiginous agent. However, his symptoms and positional nystagmus did not improve, so the right lateral semicircular canal was plugged by surgery. One month after surgery, his positional vertigo and nystagmus were completely resolved. We speculated that the cause of the patient’s intractable light cupula was an enlarged cupula caused by his idiopathic sudden hearing loss.

The lesion site of vestibular dysfunction in Ramsay Hunt syndrome: A study by click and galvanic VEMP

2007 ◽  
Vol 16 (4-5) ◽  
pp. 217-222
Author(s):  
Hidenori Ozeki ◽  
Shinichi Iwasaki ◽  
Munetaka Ushio ◽  
Naonobu Takeuchi ◽  
Toshihisa Murofushi
Keyword(s):  
Semicircular Canal ◽  
Vestibular Dysfunction ◽  
Vestibular Nerve ◽  
Vestibular Evoked Myogenic Potentials ◽  
Lesion Site ◽  
Lateral Semicircular Canal ◽  
Caloric Testing ◽  
Ramsay Hunt Syndrome ◽  
Hunt Syndrome ◽  
Vestibular Symptoms

Ramsay Hunt syndrome (RHS) is characterized by vestibulocochlear dysfunction in addition to facial paralysis and auricular vesicles. The present study investigated the lesion site of vestibular dysfunction in a group of 10 RHS patients. Caloric testing, vestibular evoked myogenic potentials by click sound (cVEMP) and by galvanic stimulation (gVEMP) were used to assess the function of the lateral semicircular canal, saccule, and their afferents. The results of caloric testing (all 10 cases showed canal paresis) mean the existence of lesion sites in lateral semicircular canal and/or superior vestibular nerve (SVN). Abnormal cVEMPs in 7 patients mean the existence of lesions in saccule and/or inferior vestibular nerve (IVN). Four of the 6 patients with absent cVEMP also underwent gVEMP. The results of gVEMP (2 absent and 2 normal) mean that the former 2 have lesions of the vestibular nerve, and the latter 2 have only saccular lesions concerning the pathway of VEMPs. Thus, our study suggested that lesion sites of vestibular symptoms in RHS could be in the vestibular nerve and/or labyrinth, and in SVN and/or IVN. In other words, in the light of vestibular symptoms, there is the diversity of lesion sites.

scholarly journals Comparative Study of Preoperative Radiological Findings with Intraoperative Surgical Findings in Squamosal Type of Chronic Otitis Media

2021 ◽  
Vol 10 (25) ◽  
pp. 1862-1865
Author(s):  
Sanjana Pradeep ◽  
Swaroop Dev ◽  
Jyothi Swarup Raju ◽  
Shravya Pasunuti
Keyword(s):  
Temporal Bone ◽  
Otitis Media ◽  
Semicircular Canal ◽  
Chronic Otitis Media ◽  
Sigmoid Sinus ◽  
Lateral Semicircular Canal ◽  
High Resolution Computed Tomography ◽  
Tissue Mass ◽  
Hrct Temporal Bone ◽  
A Prospective Study

BACKGROUND Chronic otitis media (COM) of squamosal type is associated with cholestatoma with potential complications. Clinical examination and high resolution computed tomography (HRCT) scans are necessary to assess the disease site and extension. The purpose of the study was to compare the preoperative HRCT findings with the intraoperative surgical findings in squamosal type of chronic otitis media as well as various parameters in HRCT temporal bone and intraoperative findings. METHODS A prospective study was conducted on 30 patients aged between 18 and 60 years of both the genders who presented with chronic otitis media squamosal type, for a period of 22 months who attended the outpatient department of ENT. RESULTS HRCT findings and intraoperative findings were compared and results were analysed. Facial canal erosion (P - 0.0031), tegmen plate erosion (P - 0.0001), sigmoid sinus plate erosion (P - 0.002) were found to be statistically significant. Lateral semicircular canal fistula (P - 0.36) and ossicular status malleus (P - 1.000), incus (P - 0.949), stapes suprastructure (P - 0.984), and stapes footplate erosion (P - 0.977) were found to be statistically insignificant. CONCLUSIONS In our study, HRCT imaging for COM squamosal type, accurately depicted the soft tissue mass, erosion of tegmen plate, sigmoid sinus plate, scutum, lateral semicircular canal fistula, incus and suprastructure of stapes erosion and the same were found intraoperatively as well. Our study showed good comparison between the preoperative HRCT scans and the surgical findings in cholesteatoma cases. HRCT is confirmed to be valuable in the diagnosis and in guiding the surgical management of cholesteatoma. KEY WORDS Chronic Otitis Media, Cholesteatoma, HRCT Temporal Bone, Modified Radical Mastoidectomy

scholarly journals A test of the lateral semicircular canal correlation to head posture, diet and other biological traits in “ungulate” mammals

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
J. Benoit ◽  
L. J. Legendre ◽  
A. A. Farke ◽  
J. M. Neenan ◽  
B. Mennecart ◽  
...  
Keyword(s):  
Semicircular Canal ◽  
Ct Scanning ◽  
Biological Traits ◽  
Large Sample Size ◽  
Strongly Correlated ◽  
Lateral Semicircular Canal ◽  
Extinct Species ◽  
Head Posture ◽  
Bony Labyrinth ◽  
Phylogenetic Regression

Abstract For over a century, researchers have assumed that the plane of the lateral semicircular canal of the inner ear lies parallel to the horizon when the head is at rest, and used this assumption to reconstruct head posture in extinct species. Although this hypothesis has been repeatedly questioned, it has never been tested on a large sample size and at a broad taxonomic scale in mammals. This study presents a comprehensive test of this hypothesis in over one hundred “ungulate” species. Using CT scanning and manual segmentation, the orientation of the skull was reconstructed as if the lateral semicircular canal of the bony labyrinth was aligned horizontally. This reconstructed cranial orientation was statistically compared to the actual head posture of the corresponding species using a dataset of 10,000 photographs and phylogenetic regression analysis. A statistically significant correlation between the reconstructed cranial orientation and head posture is found, although the plane of the lateral semicircular canal departs significantly from horizontal. We thus caution against the use of the lateral semicircular canal as a proxy to infer precisely the horizontal plane on dry skulls and in extinct species. Diet (browsing or grazing) and head-butting behaviour are significantly correlated to the orientation of the lateral semicircular canal, but not to the actual head posture. Head posture and the orientation of the lateral semicircular canal are both strongly correlated with phylogenetic history.

scholarly journals Isolated lateral semicircular canal aplasia: Functional consequences

2016 ◽  
Vol 133 (3) ◽  
pp. 199-201 ◽  
Author(s):  
G. Michel ◽  
F. Espitalier ◽  
A.-S. Delemazure ◽  
P. Bordure
Keyword(s):  
Semicircular Canal ◽  
Lateral Semicircular Canal ◽  
Functional Consequences
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