Presentation
Presents with intermittent lethargy, coughing, and gagging.
Patient Data
There is an increased soft tissue opacity at the heart base causing rightward deviation of the trachea on the dorsoventral projection. The bronchus of the caudal subsegment of the left cranial lung lobe is displaced dorsally by soft tissue opacity. The heart and pulmonary vasculature appear normal. There is mild atelectasis surrounding the deviated bronchus. The cranial subsegment of the left cranial lung lobe appears hypoinflated.
A lobular soft tissue attenuating, heterogenously contrast enhancing mass surrounds the aortic arch, which extends dorsally to about the hypaxial musculature of the thoracic vertebral column, surrounds the brachiocephalic trunk to span the width of the mediastinum, and deviates the trachea and cranial vena cava rightward. The mass also causes caudal displacement and narrowing of the carina and mainstem bronchi. The cranial mediastinal lymph nodes are moderately enlarged. There is increased opacity in the cranial lung with volume loss, compatible with atelectasis.
Case Discussion
Presumed chemodectoma. The dog underwent radiation therapy and clinical signs resolved. This case has signs relating to the compressed trachea and esophagus that resolved after treatment. Post-treatment radiographs showed a slight reduction in size of the mass.
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