Magnetic Resonance and Computed Tomographic Findings in a Case of Encephaloclastic Porencephaly in a Sulawesi Crested Macaque.

A 3-year-old intact female Sulawesi crested macaque (Macaca nigra) was referred for progressive abnormal behavior and ataxia in all four limbs. Computed tomography (CT) and magnetic resonance imaging revealed cystic lesions located in the occipital lobes and in the right cerebellar culmen, together with the presence of communication between the subarachnoid space and lateral ventricles. The lesions showed no contrast enhancement on CT. These imaging findings were consistent with porencephaly, which was confirmed on necropsy and histopathology. An inflammatory meningoencephalitis was diagnosed.