Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low causing crowding of the bronchovascular structures . Bibasilar opacities in the superior segment of the left lower lobe and posterior right lower lobe are concerning for multifocal pneumonia . There is no pleural effusion , and the heart is normal .
    OUTPUT:
    
Bilateral lower lobe opacities are concerning for multifocal pneumonia , possibly secondary to aspiration given history of drug abuse . Asymmetrical edema is less likely . Recommend follow - up radiograph after treatment to assess for resolution .