Page 238 - Atlas of Small Animal CT and MRI

228 Atlas of Small Animal CT and MRI

Figure 2.8.6 Intraventricular Meningioma (Feline) CT & MR

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

(d) T1+C, TP (e) T1+C, DP (f) GP, TP
13y MC Domestic Shorthair with intracranial neurologic signs. There is a nonuniformly T1 hypointense, T2 mixed‐intensity mass that
distends the third ventricle (a,b: large arrow) and results in lateral ventriculomegaly (a,b: arrowheads). The mass also appears to have
an extraventricular component involving the falx cerebri (a,b: small arrows). An unenhanced CT image (c) reveals the mass to be
mineralized, which explains the heterogenous T1 and T2 hypointensity seen on MR images. There is moderate to marked nonuniform
enhancement following contrast administration (d,e). Postmortem examination confirmed the presence of a predominantly intraven-
tricular psammomatous meningioma (f: arrows).

228