10 year old Shih Tzu

Findings

There is a large, round mass in the cranial mediastinum which is displacing the trachea dorsally and the cardiac silhouette caudally on the lateral projection. There is also increased fat opacity extending ventral to the cardiac silhouette and displacing it dorsally. There is mediastinal widening on the ventrodorsal projection. The pulmonary parenchyma appears normal. In the portion of the abdomen included, the liver is mildly rounded.