FIG 6.

MRI scans from a cat with neurological FIP. T2-weighted midline sagittal (a) and transverse (c) images reveal obstructive hydrocephalus of the third and lateral ventricles (black arrows). T1-weighted post-contrast sagittal (b), and pre- and post-contrast transverse (d and e, respectively) images of this same region reveal enhancement around the third and lateral ventricles (white arrows) following administration of an intravenous contrast agent (gadolinium). These features are indicative of FIP in which a pyogranulomatous inflammation is seen on the surface of the brain involving the meninges. Courtesy of Mark Lowrie, Davies Veterinary Specialists