Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP upright portable view of the chest was obtained . An azygos lobe is incidentally noted . There is increased patchy opacity at the left lower lung which could be due to aspiration and / or infection . No pleural effusion or pneumothorax . The cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
Subtle patchy opacity involving the left mid - to - lower lung could be due to aspiration and / or infection .