History
A fifteen-year-old warmblood gelding was presented at the Faculty of Veterinary Medicine of Ghent University with a prominent swelling at the proximomedial aspect of the left metacarpal bones. According to the owner, the swelling was initially small but had been growing over the last seven years. Except for a short episode of lameness after striking the mass during riding, there had not been any significant lameness during these years. Prior to referral, a radiographic and ultrasonographic examination was performed, but no biopsy of the mass had been taken yet. The horse was not being ridden at the time of presentation, because of a concurrent desmopathy of the lateral suspensory branch at the right forelimb.