Visualization of the middle ear with high resolution computed tomography and superfine fiberoptic videomicroendoscopy

Karhuketo, Tapio S.; Dastidar, Prasun; Laasonen, E. M.; Sipilä, Markku; Puhakka, H

doi:10.1007/s004050050058

Cited by 12 publications

(10 citation statements)

References 11 publications

(11 reference statements)

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“…Vergleichende Studien zeigen, dass die transpharyngeale Endoskopie überall dort Vorteile hat, wo die CT Schwächen aufweist und vice versa. Beide Verfahren werden daher als Ergänzung gesehen [60]. Indikationen für einen klinischen Einsatz stellen die 7Stenosenlokalisation sowie die 7Abklärung einer offenen Tube dar.…”

Section: Untersuchungsmethodenunclassified

Funktionsuntersuchungen der Tuba Eustachii

Martino

Thaden

Krombach

et al. 2004

HNO

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The Eustachian tube regulates the homeostasis of the middle ear. Problems with its function are predominantly found in childhood. As a consequence, otitis and hearing impairment occur. The most important muscle is the tensor tympani muscle. The complexity of the functional anatomy and physiology are reasons why no function test alone is capable of fulfilling all diagnostic needs. The predictive value of the various Eustachian tube function tests for the outcome of a tympanoplasty is not yet clear. An overview of clinically and scientifically relevant tests for the Eustachian tube function is provided.

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Section: Untersuchungsmethodenunclassified

Funktionsuntersuchungen der Tuba Eustachii

Martino

Thaden

Krombach

et al. 2004

HNO

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“…Visibility seemed to be better in the cadaver study. It is possible that mucosa and 347 Identified Identification of the structure questionable structure questionable Epitympanum 22 0 6 4 Oval window 23 0 2 3 Round window 23 0 0 3 Tympanic sinus 25 0 0 3 Facial recess 2 0 0 3 Subiculum 0 0 0 3 blood circulation in the middle ear cavity absorbed the light, so the visibility in patients was not so good when compared to the cadaver study endoscopies [5,8]. However, the same angioendoscopes were used in the cadaver study and it is also evident that some number of fibers of the endoscopes were lost during the atresia study.…”

Section: Discussionmentioning

confidence: 98%

“…The results suggest that these technologies supplement each other. They also suggested that in such cases as external ear dysplasia combining these two modalities would improve diagnosis [8].…”

Section: Introductionmentioning

confidence: 99%

Comparison of CT and fiberoptic video-endoscopy findings in congenital dysplasia of the external and middle ear

Karhuketo

Ilomäki

Dastidar

et al. 2001

European Archives of Oto-Rhino-Laryngology

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Twenty-six ears (of 25 patients) with congenital dysplasia of the external and middle ear were studied with two different types of imaging technologies in order to find out if it is possible to improve the anatomical overview of the dysplastic middle ears by combining the imaging methods. All the 26 ears were studied with computed tomography (CT), which gave cross-sectional images of the tympanic cavity. A fiberoptic video-endoscope (FVE) was introduced through the nose and via the Eustachian tube into the middle ear so that the topographic view of the anatomical structures of the middle ear could be visualized. Some structures were visualized better with FVE than with CT and vice versa. We concluded that the combined information obtained from these two imaging technologies provided a better understanding of the structural anatomy of a congenital dysplastic middle ear.

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“…Other studies have also reported that, clinically, the use of fibrescopes is restricted because of the limited resolution from the small images produced, and they do not have an angled tip to help to inspect the undersurfaces of the tympanic membrane or the recesses of the middle ear [15]. Karhuketo et al [27] compared the use of fibre-optic video-micro-endoscopy through the eustachian tube into the middle ear in ten dissected temporal bone blocks with the results of high-resolution computed tomography of the same temporal bones. These authors reported that, when high-resolution computed tomography gave good results, fibre-optic video-micro-endoscopy did not succeed well and vice versa.…”

Section: Discussionmentioning

confidence: 99%

Role of Transtympanic Endoscopy of the Middle Ear in the Diagnosis of Perilymphatic Fistula in Patients with Sensorineural Hearing Loss or Vertigo

Selmani

Pyykkö

Ishizaki

et al. 2002

ORL

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Background: The diagnosis of perilymphatic fistula (PLF) is often difficult, and therefore the condition can be overlooked. Tympanoscopy presents an alternative procedure for visualising the middle ear anatomy, and it may help to diagnose PLF. Aim: The aim of this study was to evaluate the use of middle ear endoscopy in establishing the diagnosis of PLF and in defining its incidence in patients with sensorineural hearing loss and/or vertigo and tinnitus. Subjects and Methods: Two hundred and sixty-five patients (22–80 years of age, mean 48 years) were prospectively and consecutively referred for middle ear examination with tympanoscopy. Tympanoscopy was performed using endoscopes with visual angles of 5 and 25° and an outer diameter of 1.7 mm. The round window niche (with its secondary membrane), the oval window with a stapes superstructure, a part of the facial recess and the area in the fissula ante fenestram were examined and video-recorded. Results: For 1 patient, tympanoscopy revealed fistula in the round window membrane that was covered with a fibrinous layer. In 4 cases abnormal mucosal shining appeared in the round window, but no PLF was present. In 7 cases the tympanic cavity could not be visualised because of the adhesive tympanic membrane, abnormal anatomy or the prominent exostoses of the external ear canal. In 6 cases a postendoscopic middle ear infection was found. No permanent tympanic membrane perforation occurred in any of the patients in this study. Conclusions: Tympanoscopy is a rapid examination tool with which to verify certain areas of the middle ear anatomy, but it is of limited value for ruling out the presence of PLF.

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Visualization of the middle ear with high resolution computed tomography and superfine fiberoptic videomicroendoscopy

Cited by 12 publications

References 11 publications

Funktionsuntersuchungen der Tuba Eustachii

Funktionsuntersuchungen der Tuba Eustachii

Comparison of CT and fiberoptic video-endoscopy findings in congenital dysplasia of the external and middle ear

Role of Transtympanic Endoscopy of the Middle Ear in the Diagnosis of Perilymphatic Fistula in Patients with Sensorineural Hearing Loss or Vertigo

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