What is your diagnosis? Radiographic diagnosis - Mixed lytic-proliferative lesion in the left tibia

摘要

A 13-year-old mixed-breed mare was evaluated because of a 2-year history of hind limb lameness. On examination, the horse was graded as 3/5 lame on the left hind limb. Palpation of a swollen area on the proximomedial portion of the tibia elicited a strong response, presumably from pain. Radiographs of the left stifle joint were obtained (Fig 1).