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Bilateral cavitary plaques. Axial (top row) and coronal (bottom row) CT scans show the presence of abnormal CSF-attenuating focal lesions (arrows) involving the anterior and inferior walls of the IAC next to the basal turn of the cochlea. Additionally, there are noncavitary plaques (arrowheads) around the cochlea on the right (A) and at the fissula ante fenestram on the left (B and D).
