Presentation
Presented for a 3-week history of a productive cough.
Patient Data
There is a well defined soft tissue mass surrounding the tracheal carina and visible in the caudal portion of the left cranial lung lobe on the DV projection. There is volume loss of the caudal portion of the left cranial lung lobe associated with minimal mediastinal shift. On the right lateral projection, a lobar sign is present between the caudal portion of the left cranial and left caudal lung lobes. In the remainder of the pulmonary parenchyma, there is a moderate bronchial pattern. There is an ill‑defined soft tissue nodule in the 9th intercostal space on the right side.
These findings are suggestive of primary pulmonary neoplasia with pulmonary metastasis or hilar lymphadenopathy, with secondary compression of the bronchus and collapse of the left cranial lung lobe.
Case Discussion
A fine needle aspirate of the larger mass was performed with ultrasound guidance. Cytology diagnosis was pulmonary adenocarcinoma (primary or metastatic).
Adenocarcinoma is the most common primary pulmonary tumor in cats. 80% of pulmonary carcinomas metastasize in cats, to lung, pulmonary pleura (carcinomatosis), regional lymph nodes, and distant sites including the digits 1.
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