Page 219 - Atlas of Small Animal CT and MRI

Infectious Inflammatory Disorders 209

Figure 2.7.2 FIP‐Associated Encephalitis and Ventriculitis (Feline) MR

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

(d) T1, SP (e) T1+C, SP (f) T1+C, TP

(g) T1+C, TP (h) T1+C, TP (i)
9mo MC Domestic Shorthair with 2‐week history of lethargy, inappetence, and reduced motor function in the pelvic limbs. The ventricular
system is markedly and uniformly enlarged, indicative of obstructive hydrocephalus (a–d). The choroid plexus of the floor of the lateral
ventricles is enlarged (b: arrowheads). The cerebrospinal fluid (CSF) appears abnormally hyperintense on the FLAIR image, indicating a
high cellularity or macromolecular content (c: arrowheads). There is nonuniform T2 and FLAIR hyperintensity of the white matter in both
hemispheres consistent with the presence of vasogenic edema. Contrast‐enhanced T1 images reveal uniform and intense enhancement
of a thickened ependymal lining but no parenchymal enhancement (e–h). MR imaging findings characteristic of this disorder can be quite
shocking (f,i). Based on the combination of clinical signs, MR findings, and CSF analysis, a clinical diagnosis of feline infectious peritonitis
associated encephalitis and ventriculitis was made.

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