Page 43 - Atlas of Small Animal CT and MRI
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Figure 1.2.9 Otitis Media and Interna—Cranial Nerve VIII Involvement (Canine) CT
(a) CT, TP (b) CT, TP
(c) CT+C, TP (d) CT+C, TP
6y MC Cocker Spaniel with chronic ear infections. Bilateral ear canal ablations were performed 2 years previously, and the dog has recently
developed right‐sided peripheral vestibular signs. On sequential unenhanced images, the right tympanic bulla is filled with fluid‐attenuating
material, and there is partial osteolysis of the bulla wall laterally. The right internal acoustic meatus (b: arrowhead) and a portion of the
cochlea (b: arrow) are seen. On contrast‐enhanced images, there is enhancement of tissues surrounding the tympanic bulla consistent with
a clinically confirmed abscess. There is also focal intracranial contrast enhancement in the location of the cochlear branch of the vestibuloc-
ochlear nerve (c,d: arrow), suggesting extension of disease through the internal acoustic meatus.
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