Swollen limb

An 11-year-old FS Greyhound was presented for recent left swelling at the humeral head, extending to radius/ulna/foot. This had happened once before in the past. No history of  fever, toxic insult, puncture wound, etc. However the dog loves to run through the owner's property. Radiograph showed a swelling at left humeral head. VDIC suggested ultrasound to view axillary vessels looking for thrombosis. No boney tumor was seen.