This week’s case is a 9-year-old female neutered Siamese cat with chronic, progressive cough of 1-year duration. What is the cause of the increased opacity in the right hemithorax?
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Radiographs: There are mild diffuse bronchointerstitial infiltrates. There is focal mineralization caudal and slightly right-sided to the hilus within the lungs. There is also increased soft tissue opacity of the right cranial and right middle lung lobes with mild volume loss and rightward mediastinal shift. A lobar sign is visualized at the junction of the right middle and right caudal lung lobes on the left lateral projection.
CT: There is complete collapse of the right cranial and right middle lung lobes, which are diffusely contrast enhancing and have multifocal heterogenous mineralization. There is an accumulation of mineral-dense material within the accessory bronchus, with near complete occlusion of the lumen. Wispy soft tissue material is also present in the right main stem bronchus, at the origin of the right cranial bronchus. Diffusely, there is marked airway thickening and patchy interstitial infiltrates.
- Mild diffuse bronchointerstitial pulmonary infiltrates, suggestive of chronic lower airway disease.
- Partial atelectasis of the right cranial and right middle lung lobes.
- Chronic lower airway disease causing mucus plugging and atelectasis of the right cranial and middle lung lobes.