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4. Isolated Traumatic Dislocation of the Malleus into the External Auditory Canal.

Author

Lee, Jong Hwan, Choi, Ji Woong, Jeong, Do Yoon, Alanazy, Sultan Mohammed, and Nam, Gi-Sung

Subjects
EAR ossicle surgery, TEMPORAL bone radiography, PROSTHETICS, EAR canal, JOINT dislocations, ARTIFICIAL implants, TYMPANIC membrane, HEARING disorders, CYCLING accidents, COMPUTED tomography, EAR ossicles, HEAD injuries
Abstract

We report a rare case of isolated malleus dislocation into the external auditory canal with lateralized intact tympanic membrane following a head trauma. The patient was a 63-year-old woman who presented at the outpatient department of our institute with hearing loss of 10 years' duration after a bicycle accident. During physical examination of the patient, total dislocation of the malleus-like bony structure into the external auditory canal on the right side was observed. In the computed tomography scan, an isolated malleus dislocation with intact incus-stapes articulation was identified. The patient was successfully treated with endoscopic exploratory tympanotomy and partial ossicular replacement prosthesis. The isolated malleus dislocation can rarely occur after trauma. A careful diagnostic step through history, physical examination, and temporal bone computed tomography scan are needed to confirm this rare condition. [ABSTRACT FROM AUTHOR]

Published
2023
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8. Supplemental Material, sj-pdf-1-ear-10.1177_01455613211026529 - Isolated Traumatic Dislocation of the Malleus into the External Auditory Canal

Author

Lee, Jong Hwan, Choi, Ji Woong, Jeong, Do Yoon, Alanazy, Sultan Mohammed, and Nam, Gi-Sung

Subjects
110315 Otorhinolaryngology, FOS: Clinical medicine, otorhinolaryngologic diseases, sense organs
Abstract

Supplemental Material, sj-pdf-1-ear-10.1177_01455613211026529 for Isolated Traumatic Dislocation of the Malleus into the External Auditory Canal by Jong Hwan Lee, Ji Woong Choi, Do Yoon Jeong, Sultan Mohammed Alanazy and Gi-Sung Nam in Ear, Nose & Throat Journal

Published
2021
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22. Bilateral Horizontal Canal Dysplasia Presenting as Hearing Loss With Recurrent Vertigo Mimicking Meniere’s Disease

Author

Baek, Wonyong, Lee, Young Jae, and Nam, Gi-Sung

Abstract

We report an extremely rare case with bilateral horizontal semicircular canal (HSC) dysplasia presenting as hearing loss with recurrent vertigo mimicking Meniere’s disease in a previously healthy 49-year-old male patient. HSC malformation is one of the common isolated developmental anomalies of the bony labyrinth usually associated with varying degree of hearing loss. He suffered from recurrent episodes of vertigo lasting more than 20 minutes accompanied by left hearing loss and tinnitus for 3 years. Pure-tone audiometry revealed a mild to moderate hearing loss at low frequencies in the left ear. Bithermal caloric testing revealed significant left-sided canal paralysis, but other vestibular testing was normal. Computerized tomography (CT) of the temporal bone showed the left HSC hypoplasia lacking a central bony island fused together with an enlarged vestibule, and right dysplasia, finally diagnosed with bilateral HSC dysplasia. Meniere’s disease-like recurrent vertigo attack and hearing loss were suspected to be caused by subsequent endolymphatic hydrops which could be due to HSC dysplasia.

Published
2024
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23. Assessing the Vestibulo-ocular Reflex of Contralesional Sides According to Head Impulse Velocity Utilizing the Video Head Impulse Test in Patients with Vestibular Neuritis.

Author

Baek W, Jae Lee Y, Oh J, Cho SI, and Nam GS

Subjects
Humans, Male, Female, Middle Aged, Adult, Aged, Semicircular Canals physiopathology, Video Recording methods, Head Movements physiology, Reflex, Vestibulo-Ocular physiology, Head Impulse Test methods, Vestibular Neuronitis physiopathology, Vestibular Neuronitis diagnosis
Abstract

There is a lack of comparative studies examining changes in vestibulo-ocular reflex (VOR) gain with head velocity in the video head impulse test (vHIT) of patients with vestibular neuritis (VN). Thus, the purpose of present study was to identify the effect of head impulse velocity on the gain of the VOR during the vHIT in patients with VN. Head impulse velocities ranging from 100%-200°/s [158.08 ± 23.00°/s in the horizontal canal (HC), 124.88 ± 14.80°/s in the anterior canal (AC), and 122.92 ± 14.26°/s in the posterior canal (PC) were used during vHIT trials of 32 patients with VN. Differences in VOR gain on the ipsilesional and contralesional sides according to head velocity were analyzed. The mean VOR gains in ipsilesional side were decreased to 0.47 in the HC and 0.56 in the AC, leading to marked asymmetry compared to the contralesional side; PC gain was relatively preserved at 0.82 in the ipsilesional side. The mean head impulse velocity applied during vHIT trials in each semicircular canal plane did not differ bilaterally. On the contralesional side, VOR gain was negatively correlated with head impulse velocity (R2=0.25, P=.004 in HC; R2=0.17, P=.021 in AC; R2=0.24, P=.005 in PC), while VOR gain on the ipsilesional sides of the HC and AC was not. Head impulse velocity may have a differential impact on VOR gain, depending on the degree of deficit. Increasing head velocity in vHIT may be considered to identify subtle deficits on the contralesional side of patients with VN.

Published
2024
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