Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volume is slightly low . Focal opacity at the right upper lung is new since ___ . There is no pneumothorax or large pleural effusion . Trace subsegmental atelectasis at the left base . Cardiomediastinal silhouette is exaggerated by low lung volume .
    OUTPUT:
    
New right upper lung opacity may reflect pneumonia . Other etiologies for focal opacities are not excluded . Followup radiograph is recommended in 6 weeks after the completion of treatment to insure resolution and rule out possibility of a mass .