Cystic Periosteal Osteosarcoma in the Tibia of a Dog

Abstract

SummaryPeriosteal osteosarcoma, a rare neoplasm in dogs, was diagnosed in an eleven- year-old Golden Retriever. In this case, the tumour formed a single, large, fluid filled cyst, that originated from the periosteum of the tibia. Periosteal osteosarcomas are intermediate grade tumours and behave less aggressively than central osteosarcomas, however, they are more malignant than the low grade parosteal osteosarcoma. Cure for periosteal osteosarcoma in people may be achieved in 70-80% of cases by local excision. In this case euthanasia was elected one year post-amputation due to emaciation and lethargy associated with metastatic disease.A cystic periosteal osteosarcoma was diagnosed in an eleven year old Golden Retriever. The tumour originated from the tibia and formed a single large fluid filled cyst. Periosteal osteosarcomas are rare, moderately aggressive tumours that may be differentiated from parosteal, surface, and central osteosarcomas. In this case euthanasia was elected one year post-amputation due to metastatic disease.