Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is rotated to the left . Punctate calcifications again seen at the right costophrenic angle which are chronic . There is vague increased opacity at the lateral aspect of the left mid lung . Elsewhere , lungs are clear . The cardiomediastinal silhouette is within normal limits for technique . No acute osseous abnormalities .
    OUTPUT:
    
Subtle left midlung opacity which could be due to atelectasis in the setting of lower lung volumes . Possibility of infection ca n't be excluded .