On both views the cardiac silhouette is obscured.
There are multiple fissure lines, and evidence of pleural effusion.
Fluid analysis revealed high content of neutrophils and intracellular bacteria. These findings were compatible with pyohorax. Aerobic and anaerobic cultures were sent.
Fusobacterium was isolated.
The images below were taken few days after treating with antibiotics and drainage.
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There is a diffuse broncointerstitial pattern which can be a result of the current disease or due to a chronic airway disease.
There are small ill defined soft tissue opacities which may represent pocketing of fluid or focal pulmonary infiltrates. Neoplasia or abscesstion are possible.
There is still a very small amount of pleural effusion.
On the lateral view there is a fissure line which probably represents pleuritis (red arrow).
The cardiac silhouette is generally enlarged.
There is atelectasis of the  cranial subsegment of the left cranial lung lobe which is allowing the heart to shift to the left.