A 6-year-old neutered male domestic shorthair cat was evaluated for left pelvic limb lameness of 3 months' duration. The cat lived indoors but had access to the outside. Conservative management with meloxicam and a glucosamine-chondroitin sulfate product resulted in apparent resolution of the lameness. Two weeks prior to evaluation, the lameness recurred and a mass was detected on the medial aspect of the left tarsal region. The cat's vaccination status was adequate, and results of tests for FeLV and FIV were negative.
A weight-bearing lameness of the left pelvic limb was detected during physical examination. Palpation of the left