A 6-year-old female Cocker Spaniel with a choroid plexus papilloma had clinical signs of disease of the central nervous system for 1 month. The neoplasm originated from the right choroid plexus of the fourth ventricle and had displaced contiguous parts of the medulla oblongata and cerebellum. It was well differentiated and was composed of papillae arranged in an arboriform pattern. The papillae were lined by a single layer of non ciliated epithelium.
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