Page 252 - Atlas of Small Animal CT and MRI

242 Atlas of Small Animal CT and MRI

Figure 2.8.21 Metastatic Melanoma (Canine) MR

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

(d) T1+C, TP (e) T1+C, SP
7y MC Rottweiler with hypermetric gait, head tilt, and ataxia. The dog also has a lingual mass. There is a T1, T2, and FLAIR hyperintense
mass involving the vermis of the cerebellum, associated with surrounding edema (a–c). The mass enhances following contrast
administration, although the extent and uniformity of enhancement are indeterminate because of the underlying intensity present on
unenhanced T1 images (d,e). The lingual mass proved to be a melanoma that had also metastasized to lung. The unusual hyperintensity
of the mass on the unenhanced T1 image is a reported characteristic of melanotic melanomas.

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