Fig. 12.

Classical MRI features of a cat with ependymitis and ventricular distension due to infection with feline coronavirus (a, c–d) (neural form of feline infectious peritonitis, FIP). Distension of the lateral and third ventricles is mild. Deformation of the interthalamic adhesion suggests increased intraventricular pressure. Transversal T2-weighted images (c) do not reveal periventricular hyperintensities that become obvious in FLAIR (d). Strong contrast enhancement proves ependymitis (e). CSF examination and determination of coronavirus protein using PCR from CSF result in the diagnosis of coronavirus encephalitis