Page 259 - Atlas of Small Animal CT and MRI

Sella and Parasellar Region 249

Figure 2.9.4 Pituitary Cyst (Canine) MR

(a) T1, SP (b) T1, SP

(c) T1, TP (d) T2, TP (e) T1+C, TP
10y FS Labrador Retriever with acute obtundation and disorientation. The dog had multiple meningiomas involving the right cerebrum
and pons, causing the clinical signs, and the cystic pituitary gland was an incidental finding. Image b represents a magnified view of
image a. Images c–e are representative close‐up views of the pituitary fossa in the transverse plane. The pituitary fossa contains a
predominantly T1 hypointense and T2 hyperintense cyst (a–d) with a thin rim that is isointense to adjacent deep gray matter (c: arrows).
The cyst enhances peripherally (e: arrows). Ill‐defined T2 hyperintense edema is present in the hypothalamus (d) because of the
meningiomas.

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