Page 280 - Atlas of Small Animal CT and MRI
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270  Atlas of Small Animal CT and MRI


              Figure 2.10.5  Cranial Nerve II Meningioma (Canine)                                    CT & MR





















             (a) CT+C, DP                     (b) CT+C, TP




















             (c) CT+C, OP                     (d) CT+C, OP





















             (e) T1+C, DP                     (f) T1+C, TP                     (g) T1+C, TP
             10y FS Kelpie with right exophthalmia and absent menace response of 3­week duration. The right optic nerve is enlarged and has a
               nonuniform diameter (a–c: arrow). The meningeal sheath intensely enhances. Oblique plane images were generated to approximate the
             path of the right (c) and left (d) optic nerves through their respective optic canals (c,d: arrow). A right orbital exenteration was performed,
             and a right optic nerve meningioma was confirmed histologically.
               The dog returned 2 years later with clinical signs referable to intracranial neurologic disease. The proximal remnant of the right optic
             nerve is enlarged, irregularly margined, and nonuniformly contrast enhances (e: arrow). The mass now includes both retrobulbar and
             intracranial components (e–g: arrowhead).



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