Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Subtle patchy right base opacity is seen which is nonspecific and could be due to atelectasis or infection . The left lung is clear . There is no pleural effusion or pneumothorax . The cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
Patchy right base opacity , atelectasis vs infection ; the lung bases are better assessed on the CT .