There is dorsal deviation of the entire thoracic trachea. There is caudal displacement of the carina to the 7th intercostal space. There is border effacement of the cranial aspect of the cardiac silhouette, and there is soft tissue opacity within the cranial and left aspect of the thorax. There is a mediastinal shift towards the right.
Increased soft tissue opacity within the cranial and left aspect of the thorax with a mediastinal shift towards the right is consistent with a space occupying lesion. Differentials for organs of origin include pulmonary and lesser consideration given to mediastinum and pleural space. Differentials for the mass include neoplasia, granuloma, abscess and lesser consideration given to hematoma.