Presentation
Presents with a 2-week history of increased respiratory effort and several days of inappetence.
Patient Data
There is an increased soft tissue opacity in the region of the accessory lung lobe or caudal mediastinum that silhouettes with the diaphragm and obscures the caudal cardiac silhouette. Soft tissue opacity fissure lines are visible between several lung lobes. There is a mild bronchial pattern throughout the lungs.
On CT images, the mass is peripherally contrast enhancing and contacts both the heart and the diaphragm. The caudal vena cava is in contact with the mass and is mildly compressed, and the esophagus is dorsally displaced. Differentials remain a caudal mediastinal or accessory lung lobe mass, likely neoplastic.
Case Discussion
The mass was found to be adhered to the pericardium and diaphragm at surgery and was non-resectable. Necropsy diagnosis was accessory lung lobe adenocarcinoma with squamous metaplasia and with extension to the diaphragm and epicardium.
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