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Hyperostose des Meatus acusticus internus

Ein Zufallsbefund?

Hyperostosis of the internal auditory canal

An incidental finding?

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Zusammenfassung

Im Gegensatz zu den nicht ungewöhnlichen Exostosen im äußeren Gehörgang, sind Hyperostosen/Osteome des inneren Gehörgangs (IG) rare Veränderungen. In der Kasuistik zeigte sich bei einer akuten sensorineuralen Schwerhörigkeit rechts eine Hyperostose im IG mit Einengung des Meatus acusticus internus beidseits. In der Literatur sind Ausfälle des VII. und VIII. Hirnnervs beschrieben, wobei ein Kausalzusammenhang kontrovers diskutiert wird. Entsprechend muss die Indikation zur chirurgischen Intervention äußerst zurückhaltend gestellt werden. Trotz der Aufarbeitung von fast 1000 Magnetresonanz(MRT)-/Computertomographie(CT)-Untersuchungen konnte keine weitere Hyperostose im Felsenbein nachgewiesen werden. Es handelt sich folglich um eine sehr seltene Erkrankung, welche als Differenzialdiagnose angesehen werden sollte.

Abstract

In contrast to the fairly common exostoses in the external auditory canal, hyperostoses and osteomas of the internal auditory canal are extremely rare. In this case report we present a patient with sudden right-sided sensorineural hearing loss, in whom imaging revealed hyperostosis with bilateral stenosis of the internal auditory canal. Whether the connection of such radiological findings with dysfunction of cranial nerves VII and VIII be causal or coincidental is controversially discussed in the literature. Therefore, the indication for surgical intervention should be considered with extreme caution. Despite examination of our radiology database comprising almost 1000 MRI/CT temporal bone investigations, we could find no other cases of hyperostosis of the petrous bone. This case thus represents a rare disease, which should be considered a differential diagnosis.

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Einhaltung ethischer Richtlinien

Interessenkonflikt. P. Mastromonaco und S. Stöckli geben an, dass kein Interessenkonflikt besteht.

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Mastromonaco, P., Stöckli, S. Hyperostose des Meatus acusticus internus. HNO 63, 516–519 (2015). https://doi.org/10.1007/s00106-014-2910-9

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  • DOI: https://doi.org/10.1007/s00106-014-2910-9

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