Obtaining a conclusive definitive diagnosis for an intra-ventricular tumour in a dog can be challenging. In doing so, all differential diagnoses should be considered. Differentiation between choroid plexus tumours (CPTs) (a choroid plexus papilloma, atypical choroid plexus papilloma or choroid plexus carcinoma) and gliomas, including ependymoma, oligodendroglioma and astrocytoma should be considered. Histopathologic features and immunohistochemistry are essential in the differentiation between intraventricular tumours. A 4-year-old Boerboel dog presented with a left head tilt and a wide range of nonspecific clinical abnormalities not limited to weight loss, depression and marked bradycardia. MRI proved useful in providing a diagnosis of an intra-ventricular tumour and demonstrated the potential of choroid plexus carcinomas (CPCs) to metastasize. In this case, the histological features displayed malignancy with invasion into the neuroparenchyma, drop metastasis and immunohistochemistry with E-cadherinpositive result that assisted with differentiation of CPC from other tumours.

Pemphigus foliaceus (PF) is an autoimmune acantholytic skin disease described in humans, dogs, cats, horses, goats, and sheep. From 2003 to 2016, six Arabian oryx ( Oryx leucoryx) at the National Zoological Garden in Pretoria, South Africa, developed progressive, bilaterally symmetrical, hyperkeratotic skin lesions and pustules consistent with PF. Lesions were similar to those observed in domestic animals and primarily affected the pinnae, face and nasal planum, distal legs, and tail tip. Histological evaluation of suspect PF skin lesions in affected animals, evaluation of medical records for treatments received, causative agents in the diet and environment, and special stains for infectious organisms yielded no consistent inciting cause. The Arabian oryx is a species highly adapted to arid environments of the desert and has recently survived from a severe genetic bottleneck; both of these factors may have contributed to the development of PF in these animals.