Page 244 - Atlas of Small Animal CT and MRI

234 Atlas of Small Animal CT and MRI

Figure 2.8.13 Ependymoma (Canine) MR

(a) T1, TP (b) T2, TP (c) FL, TP

(d) T1, SP (e) T1+C, SP (f) T1+C, TP

(g) GP, TP
7y MC German Shorthair Pointer with 2‐week history of behavioral changes and neurologic deficits. There is a well‐demarcated ovoid
mass within the third ventricle, which is predominantly T1, T2, and FLAIR hyperintense (a–d). The mass deforms the lateral ventricles,
but there is minimal hydrocephalus and no peritumoral edema. The mass intensely and nonuniformly enhances following contrast
administration (e,f). Postmortem examination confirmed an ependymoma within the third ventricle (g). The granular appearance on cut
surface correlates with the irregular cobblestone appearance of the tumor on MR images. An unrelated diagnosis of lymphoplasmacytic
meningitis explains the meningeal contrast enhancement seen in image f.

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