Page 268 - Atlas of Small Animal CT and MRI

258 Atlas of Small Animal CT and MRI

Figure 2.9.15 Pituitary Carcinoma (Canine) MR

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

(d) T1+C, SP (e) T1+C, TP (f) T1+C, DP
10y MC Pointer cross with progressive depression, ataxia, and blindness. Images b, c, and e are representative transverse images at the
level of the pituitary fossa. Images a and d are comparable images oriented in the sagittal plane. Image f is a representative dorsal plane
image that includes the optic chiasm. The pituitary gland is markedly enlarged (height = 22 mm, depth = 22 mm), extends dorsally into the
hypothalamic and thalamic regions, and is mildly T1 hypointense and T2 hyperintense compared to deep gray matter (a–c). The mass is
uniformly contrast enhancing, and margins are irregular and extend well beyond the rostral extent of the pituitary fossa (d: arrow),
encroaching on the optic chiasm (d,f: arrow). The mass was confirmed to be a pituitary adenocarcinoma on postmortem examination.

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