Case history A 7-year-old castrated male Turkish Angora cat was referred to the Veterinary Teaching Hospital of Konkuk University (Korea) with a 3-month history of rightforelimb monoparesis. The patient showed neurological deficits in the right forelimb, except for digital deep-pain perception, and could not ambulate normally. Blood cell count, serum biochemistry, and electrolyte results were within the reference ranges. Radiography showed bony proliferation at the ventral margin and lateral

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... nsverse region of the vertebral bodies Abstract: Aggressive osteoblastoma is a type of bone tumor rarely reported in veterinary literature. Osteoblastoma may be misdiagnosed as an osteosarcoma, which is a well-understood malignant bone tumor. Owing to poor prognosis, animals diagnosed with osteosarcoma are not always treated. In the present case, we diagnosed the tumor as aggressive osteoblastoma on the basis of macroscopic, microscopic, radiographic, and immunohistologic findings. The patient was treated via resections of the osteoblastoma and lived without metastasis for 3 years. This is the first reported case of aggressive feline osteoblastoma of the cervical vertebrae and will be useful for diagnosing and managing aggressive osteoblastoma.