From the case:
Eustachian tube: annotated CT
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Annotated CT of the facial bones which nicely demonstrates the path of the eustachian tube from the middle ear to the nasopharynx
From the case:
Eustachian tube: annotated CT
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The same CT facial bones without above annotations
Case Discussion
Following the eustachian tube in CT scans can be difficult as it is not always patent along its entire length. However, if the patient were to perform a valsalva manoevre, this space would likely open up and become easily visible.
In this particular scan the patient is not performing such a manoevre, but the path is still visible.