A case of canine primitive neuroectodermal tumor (PNET)

A 2-year and 6 month-old, female, Golden Retriever showed circling behavior and seizure. By magnetic resonance imaging (MRI) examination, a mass was f ound on the surface of the left cerebral hemisphere, invading to the left t emporal muscle. The skull bone between them was destroyed. The dog was euth anized and necropsied. Histologically, the mass contained a lot of undiffer entiated anaplastic cells, forming Homer-Wright rosettes and pseudopalisadi ng patterns. Thus, the case was diagnosed as primitive neuroectodermal tumo r (PNET).