Page 236 - Atlas of Small Animal CT and MRI

Figure 2.8.3 Macrocystic Meningioma (Canine) MR

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

(d) T1+C, TP (e) T1+C, SP (f) T1+C, DP
8y MC Golden Retriever with recent onset of seizures. There is a sessile T1 and T2 hyperintense mass involving the left olfactory bulb/
frontal lobe region (a,b: arrow) with an adjacent T1 hypointense, T2 hyperintense, and FLAIR‐nulling cystic component (a–c: arrowhead).
The solid component of the mass intensely and uniformly enhances following contrast administration (d–f). There is a thin rim of
enhancement in the cystic part, but it is otherwise unchanged.

Figure 2.8.4 Meningioma with Hyperostosis (Feline) MR
15y FS Domestic Shorthair with acute onset
of seizures. There is a broad‐based, mildly T1
hypointense, T2 mixed‐intensity mass involv-
ing the right frontoparietal region of the brain,
causing marked displacement of the adjacent
cerebrum (a,b: large arrow). The thin T2
hyperintense rim lends further evidence that
this is an extraaxial mass (b: arrowheads).
The overlying parietal bone is thickened and
hypointense as a result of bone reactivity and
resulting hyperostosis (a,b: small arrows). The
(a) T1, TP (b) T2, TP
mass intensely and heterogeneously enhances
following contrast administration. Marked
brain compression by the mass was evident
on postmortem examination (d: arrow), and
a diagnosis of meningioma was confirmed
histologically.

(c) T1+C, TP (d) GP