Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs were provided . Opacity in the left mid and lower lung zones with obscuration of the left hemidiaphragm and heart border are concerning for middle and lower lobe pneumonia . Lung volumes are low . Cardiomediastinal silhouette is unremarkable . Small bilateral pleural effusions may be present , worse on the left . There is no pneumothorax . The osseous structures are intact .
    OUTPUT:
    
Opacity in the left mid and lower lung concerning for pneumonia . Possible small bilateral pleural effusions .