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“High jugular bulb”:clinical feature, radiographical findings and differential diagnosis, a case report Masahiko MURAO 1 , Hirooki KOJIMA 1 , Nobuhiko TAKEMURA 1 , Tomio TSUCHIDA 1 1Department of Neurosurgery, Tokyo Metropolitan Bokutou Hospital Keyword: high jugular bulb , differential diagnosis , MR angiography , clinical feature pp.755-758
Published Date 1996/8/10
DOI https://doi.org/10.11477/mf.1436901259

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  • Abstract
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Anatomically, the top portion of the jugular bulb lies just below the floor of the hypotympanum. In rare in-stances, it can protrude upward and elevate the floor of the hypotympanum thus placing it in the middle ear. Such a case is called high jugular bulb. This anatomical variation has been found in 3.5% to 6% of the temporal bones studied in several reports. But, clinically, only 43 cases have been reported, because in most cases they are asymptomatic.

A 17-year-old female was hospitalized with right hearing disturbance and dizziness. Neurootological ex-amination revealed sensory neuronal hearing disturban-ce. A caloric test was scaled out. Axial bone window CT scan demonstrated an enlarged jugular bulb and an extended upward projecting hypotympanum. MRI indi-cated flow void in the same region. Retrograde jugu-lography has been the most useful method for diagno-sis but we were able to diagnose it by noninvasive MR angiography. High jugular bulb is an unfamiliar disease entity for neurosurgeons, but we should remember that it is one of the differential diagnosis for c-p angle re-gions or jugular foramen regions.


Copyright © 1996, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1251 印刷版ISSN 0301-2603 医学書院

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