CT SCAN-HRCT TEMPORAL BONE/MSTOIDS LabTest

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The advent of high-resolution computed tomography (CT) scanning in the 1980s has revolutionized diagnostic imaging of the temporal bone. CT scanning offers the greatest structural definition of any currently available imaging modality. [1, 2] The purpose of this article is to familiarize the reader with the normal anatomy of the temporal bone depicted by CT scanning. The article reviews the anatomy of the middle ear space and surrounding bone and presents radiographic imaging in both axial and coronal views, with labeled salient features and relevant text.


An axial view through the superior portion of the temporal bone can be seen below.


A study by Visvanathan and Morrissey used high-resolution CT scanning to determine that temporal bone variations are not uncommon. Evaluating 339 temporal bones, the investigators found that the incidences of deep sinus tympani, anteriorly located sigmoid sinus, high dehiscent jugular bulb, enlarged internal auditory meatus, and enlarged cochlear aqueduct were 5.01%, 2.94%, 2.76%, 1.76%, and 0.58%, respectively.

https://emedicine.medscape.com/article/875593-overview
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