Steroid injection therapy in a feline solitary bone cyst.

A nine months old Japanese domestic cat with a solitary bone cyst, which is a benign tumor-like lesion and is particularly uncommon in feline practice was referred. Radiographic examination revealed an expansive radiolucency in the distal metaphysis of the right ulna and pathologic fracture. The histological examination demonstrated immature osteogenesis consisting of osteoblasts surrounded by connective tissue. We applied drainage and instillation of steroid solution into the cystic cavity. Clinical signs, including lameness and pain, disappeared three weeks after the therapy started. Fourteen months after the therapy, the cystic lesion of bone was remodeling successfully without re-developing. We conclude that our procedure was useful treatment in this case.