7 year old Bulldog

Findings

On the lateral images, there is increased opacity in the cranial mediastinum. The trachea is normally positioned. There is a silhouette sign with the cranial cardiac silhouette. On the ventrodorsal projection, the cranial mediastinum bulges laterally and is markedly widened. The cardiac silhouette is mildly enlarged. There are congenital vertebral anomalies and spondylosis deformans in the thoracic spine. The liver appears small.