Page 279 - Atlas of Small Animal CT and MRI

Cranial Nerves 269

Figure 2.10.4 Cranial Nerve II Chronic Suppurative Neuritis (Feline) MR
12y MC Domestic Shorthair with progressive
left‐sided exophthalmos. Images a and b are
to the left of midline in the parasagittal plane
at the level of the optic canal. Image c is
somewhat more lateral in the same plane.
A large left retrobulbar mass (a–d: asterisk)
results in rostral displacement of the ipsila­
teral globe. The mass extends caudally
through the left optic canal (a,b: large arrow)
and incorporates the optic chiasm (a,b: small
arrow). Regional meningeal enhancement is
also evident (c: arrow). The left optic nerve is
not well delineated, but neural enlargement
is assumed from the parasagittal images
(a) T1, SP (b) T1+C, SP (a,b: arrowhead). Postmortem examination
revealed severe chronic suppurative optic
neuritis and meningitis.

(c) T1+C, SP (d) T1+C+FS, DP

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