가상 유양동삭개술 모델에서 유양동 기체 생리의 변화

정대한,정훈,류은웅,박철언,변재용,여승근,박문서 대한이비인후과학회 2010 대한이비인후과학회지 두경부외과학 Vol.53 No.5

Background and ObjectivesZZIt is essential to understand gas physiology of mastoid cavity to study the pathophysiology of middle ear diseases, and the surface area and volume of mastoid mucosa are important parameters for evaluating gas physiology. However, the surface area and mastoid volume of the mastoid cavity have not been practically measured yet. Therefore, we measured and compared surface area and volume of the mastoid cavity before and after mastoidectomy using a virtual mastoidectomy model. Subjects and MethodZZWe performed a virtual mastoidectomy using 10 cases of temporal bone CT indicating pneumatic mastoid. First, we removed all air cells after outlining with irregular AOI function after loading axial CT images to Image-Pro Plus 4.0. Then we filled the removed area with equal planes using local equalization filter. Finally, we calculated and compared the total surface area, volume and area to volume (A/V) ratio by estimating their circumference and area. ResultsZZThe mean surface area of pneumatized mastoid cavity was 127.8 cm2 (range: 94.2-165.3 cm2), and the mean volume was 7.1 cm3 (range: 5.2-11.0 cm3). The mean surface area and volume were altered to 42.8 cm2 (range: 35.9-55.0 cm2) and 12.6 cm3 (range: 10.3-18.7cm3), respectively, after virtual mastoidectomy. As a result, the A/V ratio decreased from 18 to 3.4 after a virtual mastoidectomy in the pneumatic mastoid cavity. ConclusionZZWhen a complete mastoidectomy is performed in the pneumatic mastoid, the surface area is decreased by one third compared to a relatively minor increase in volume. Therefore,the surface area per unit volume is expected to greatly decrease after mastoidectomy. Some physiologic problems occurring after mastoidectomy could be more accurately explained using a virtual mastoidectomy model. Korean J Otorhinolaryngol-Head Neck Surg 2010;53:284-9

Suppurative mastoid lymphadenitis mimicking mastoiditis: a case report

Oleksii O,Tymofieiev,Natalia O,Ushko,Ievgen I,Fesenko,Olexander O,Tymofieiev,Maria O,Yarifa,Olha S,Cherniak 대한구강악안면외과학회 2021 대한구강악안면외과학회지 Vol.47 No.5

Mastoid lymph node inflammation is a rare entity. Pathological conditions in the vicinity of the mastoid processes can be challenging for maxillofacial head-neck surgeons to address. We report a case of suppurative mastoid lymphadenitis in an 18-year-old Caucasian male. To our knowledge, there are no publications that highlight the clinical, ultrasonographic, intra-, and postoperative data for any pathologic process that presented as mastoiditis.

잠재성 유양돌기염 증례

최길홍 釜算慶南耳鼻咽喉科學會 1993 임상이비인후과 Vol.4 No.1

타과 환자의 뇌 자기공명영상에서 우연히 발견된 유양동 및 중이의 이상소견:성인 및 소아군에서의 발생빈도 및 임상의의

이동희,전범조,정민교,박준욱,송기영,여상원 대한이비인후과학회 2004 대한이비인후과학회지 두경부외과학 Vol.47 No.8

Background and Objectives:The purpose of this study is to determine the prevalence of abnormalities in the mastoid cavity and middle ear in a non-ENT population, and to correlate with clinical data. Subjects and Method:Cross-sectional study. We pro-spectively evaluated a total of 100 adults and 30 children undergoing MRI scan for suspected intracranial pathology from May The T2-weighted images were reviewed. The abnormalities found on MRI were divided into 1) mastoid cavity abnormality, and 2) middle ear abnormality. Al patients were asked to complete a questionnaire pertaining to symptoms of mastoid/middle ear path-ology and history of previous otitis media. Also, their ears were examined carefuly by otoscope or otomicroscope. Results:In both groups, most of abnormalities were foof the mastoid cavity were significantly correlated to clinically significant mastoid/midle ear diseases in adults. Conclusion:Incidental MRI abnormalities in mastoid cavity and middle ear detected in a non-ENT population were relatively uncomon, compared to incidental paranasal sinus abnormalities. However, clinicians should remember the posibility of the pathologies of adults.

일측성 경화형 측두골 환자에서 정상 함기형과 경화형 측두골간의 해부학적 지표의 차이에 관한 연구

이동희,전범조,이정학,이동호,여상원 대한이비인후과학회 2005 대한이비인후과학회지 두경부외과학 Vol.48 No.5

Background and Objectives:Some pathologies, such as otitis media or E-tube dysfunction, may cause sclerosis in the temporalbone, which then tends to shrink in size. The aim of this study is to evaluate morphologic changes that result from sclerosis in thetemporal bone. Subjects and Method:We measured 9 variables on 2 axial images and 7 variables on 2 coronal images in healthyears and diseased ears of 37 unilateral chronic otitis media patients. We also measured the volume of the mastoid pneumatization.Results:The mastoid volume in the sclerotic temporal bones was significantly smaller than that in the pneumatic ones. Thedistance from sigmoid sinus to Henles spine was most significantly correlated to the degree of volume reduction, and it accountedfor about 17.7% of the total variation in volume reduction. There was no difference in sigmoid sinus types between sclerotic andpneumatic mastoids. Conclusion:The sclerosis of the temporal bone reduces the volume of mastoid pneumatization. However,the large portion of volume reduction may result from the sclerotic change in the air cell system, rather than from the shrinkage ofthe mastoid bone. So, the location of surgically-important structures in the middle and inner ears is rarely changed in the sclerotictemporal bone.

Outcomes of Modified Canal Wall Down Mastoidectomy and Mastoid Obliteration Using Autologous Materials

김보경,김효준,이승재,이은상,이세아,이종대 대한이비인후과학회 2019 Clinical and Experimental Otorhinolaryngology Vol.12 No.4

Objectives. The traditional canal wall down mastoidectomy (CWDM) procedure commonly has potential problems of altering the anatomy and physiology of the middle ear and mastoid. This study evaluated outcomes in patients who underwent modified canal wall down mastoidectomy (mCWDM) and mastoid obliteration using autologous materials. Methods. Our study included 76 patients with chronic otitis media, cholesteatoma, and adhesive otitis who underwent mCWDM and mastoid obliteration using autologous materials between 2010 and 2015. Postoperative hearing air-bone gap and complications were evaluated. Results. During the average follow-up of 64 months (range, 20 to 89 months), there was no recurrent or residual cholesteatoma or chronic otitis media. No patient had a cavity problem and anatomic integrity of the posterior canal wall was obtained. There was a significant improvement in hearing with respect to the postoperative air-bone gap (P<0.05). A retroauricular skin depression was a common complication of this technique. Conclusion. The present study suggests that our technique can prevent various complications of the classical CWDM technique using autologous tissues for mastoid cavity obliteration. It is also an appropriate method to obtain adequate volume for safe obliteration.

유양동 폐쇄술이 외이도 공명주파수에 미치는 영향

장철호,이진수 대한이비인후과학회 1999 대한이비인후과학회지 두경부외과학 Vol.42 No.12

유양동에 발생한 거대 선천성 진주종 1예

이진오,천경훈,곽명수,김영훈 대한이비인후과학회 부산,울산,경남 지부회 2012 임상이비인후과 Vol.23 No.2

Congenital cholesteatoma is a rare lesion of the temporal bone. It accounts for only 2 to 5% of all cholesteatoma, though that number is throught to be on the rise due to improved imaging techniques. The diagnosis of a congenital cholesteatoma includes a pearly white mass behind an intact tympanic membrane without history of otitis media, otorrhea, or otological surgical procedure. Congenital cholesteatoma may develop in various temporal bone sites including the middle ear cavity, petrous apex, cerebellopontine angle, external auditory canal and mastoid process. The most frequent site of origin is the middle ear cavity, whereas the rarest is the mastoid. The clinical presentation is usually an symptomatic white mass behind an intact tympanic membrane. The congenital cholesteatoma that originates in the mastoid is more difficult to diagnose due to variable clinical presentation. We recently experienced a case of congenital cholesteatoma with facial palsy in 33 year old male patient who showed normal tympanic membrane without prior history of ear disease and otologic surgical procedure. We report this case with brief review of the literatures

인공 유양돌기를 이용한 이식형 골전도 보청기용 진동체 성능 평가

정의성,성기웅,박영상,신동호 한국멀티미디어학회 2022 멀티미디어학회논문지 Vol.25 No.12

This study describes the driving principle and design of the bone conduction transducer that has improved the problems of the previously bone conduction transducer, and by evaluates the performance using the artificial mastoid. Through finite element analysis, the Lorentz force of the transducer was calculated and the shape of the vibrational membrane suitable for conductive hearing loss was derived. Compared to the previous transducer, the improved transducer has increased vibration displacement by about 6dB in all frequency bands. Based on the analysis results, a bone conduction transducer was implemented, and the output force level and total harmonic distortion were measured using an artificial mastoid. The output force level of the transducer was evaluated by comparing it with the output force level of the conventional bone conduction implant (BoneBridge). In addition, total harmonic distortion was evaluated based on ANSI S3.6 regulations. The improved transducer is judged to have a sufficient function as a transducer for bone conduction implants in the 1∼3kHz band which is the most important for speech discrimination. However, the output force level and total harmonic distortion in the low frequency band (less than 1 kHz) need improvement studies.

Bone-Conduction Sensitivity along with Static Force, Location, and Stimulus

한우재,유재형 한국청각언어재활학회 2012 Audiology and Speech Research Vol.8 No.1

This study sought to estimate bone-conducted hearing sensitivity as static force levels of the oscillator as well as identify the most sensitive bone-conducted location on the human head when stimulated by tone and speech stimuli. In Experiment I, 24 young normal hearing listeners responded to bone-conducted thresholds ranging from 250 to 8,000 Hz in three placement locations: the forehead and the left and right mastoids. At each location and across all participants, the static force applied to various forces related to the individual’ head size (i.e., Hooke’ raw). The results of this experiment indicated that increased static force would not significantly cause more sensitive (or lower) thresholds. Thresholds of the forehead placement were less sensitive than both mastoids. Experiment II involved 24 young normal hearing listeners to determine the bone-conducted hearing thresholds at five placements (i.e., condyle, jaw angle, mastoid, temple, vertex) of the head, using tones ranging from 500 to 6,000 Hz and spondee words. The results indicated that the condyle and vertex are the most and least sensitive placements, respectively, regardless of tone and speech stimuli. Such information may be extended to future series of studies related to develop effective bone-conduction communication devices under harmful noisy conditions as well as contribute to the development of a computational model of bone-conducted sound transmission pathways in the human skull.