10 year old Collie

Findings

On a lateral radiograph of the neck, there is mild increased opacity of the structures of the larynx. The laryngeal saccule is filled with air. There is mild filling of the cervical esophagus with air as well. No other abnormalities are noted.
There are multiple mineral opaque angular structures throughout the lung consistent with pulmonary osteomas. The cardiovascular structures are normal in size and shape. There is an ill-defined soft tissue opacity in the caudal mediastinum dorsal to the carina. The mainstem bronchi are mildly displaced ventrally. The esophagus is mildly distended with gas cranial to this region of increased opacity. The caudal mediastinum is widened on the dorsoventral projection.

Esophagram—There is circumferential narrowing of the esophagus in the region of the carina, with an irregular mural filling defect and soft tissue mass. The esophagus is distended and there is delayed passage of barium in real time.