4 month old kitten

Findings

At presentation: There is marked, diffuse soft tissue swelling of the left forelimb. The physis of the distal radius has a radiolucent line just proximal to it.

4 weeks later: The soft tissue swelling is decreased in comparison to the previous radiographs. Both proximal and distal growth plates of the radius are closed. There is well defined new bone formation, especially at the proximal diaphysis of the radius spreading to the mid diaphyseal region. The mid region shows no periosteal bone formation. There is, to a lesser degree, periosteal new bone formation visualized at the distal part of the radius and epiphysis. The underlying cortex of the proximal radius is not clearly visualized and there is radiolucency visualized within the cortex and medulla. There is a clear incongruency of the elbow joint. There is excessive periosteal new bone formation on the medial aspect of the of the proximal radius.