Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral views of the chest . Linear opacity at the left lung base laterally may be due to atelectasis given relatively lower lung volumes . Retrocardiac opacity is more conspicuous on today 's exam . Blunting of the posterior costophrenic angles may be due to small effusions . The lungs are clear of confluent consolidation . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities .
    OUTPUT:
    
Small bilateral effusions . Left base / retrocardiac opacities may be due to atelectasis , although clinical correlation suggested regarding possibility of infection .