Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright portable chest radiograph is obtained . The lung volumes are low . There is perihilar mid and lower lung streaky opacity which could represent atelectasis and / or atypical pneumonia . No effusion or pneumothorax . Cardiomediastinal silhouette is normal . Bony structures are intact .
    OUTPUT:
    
Streaky lower lung opacities could represent an atypical pneumonia or atelectasis .