Page 245 - Atlas of Small Animal CT and MRI

Neoplasia 235

Figure 2.8.14 Choroid Plexus Carcinoma (Canine) MR

(a) FL,TP (b) T1,TP (c) T1+C, TP

(d) GP, TP (e) T1, SP (f) T1+C, SP
8y MC dog of unknown breed with a recent onset of depression progressing to obtundation. There is a mildly T1 hypointense, FLAIR
hyperintense spherical mass in the third ventricle, causing displacement of the axial margins of the lateral ventricles (a,b). There is focal
periventricular edema dorsal to the mass (a: arrows) and nonuniform ventriculomegaly, with the mesencephalic duct and fourth ventricle
disproportionately enlarged (e: arrows). The mass intensely and uniformly enhances following contrast administration (c,f). Postmortem
examination confirmed a choroid plexus carcinoma of the third ventricle (d). The irregular cut surface of the tumor correlates with the
pattern of enhancement on MR images. The nonuniform hydrocephalus may be a result of either partial obstruction or overproduction of
cerebrospinal fluid by the tumor. Westworth et al (2008). Reproduced with permission from Wiley.
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