Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate relatively well - aerated lungs than a normal cardiomediastinal silhouette . There is mildly increased opacity in the right cardiophrenic angle , somewhat obscuring the right heart border . There is no appreciable pleural effusion or pneumothorax . The visualized upper abdomen is unremarkable .
    OUTPUT:
    
Mildly increased opacity in the right cardiophrenic angle . Although atelectasis can have this appearance , in the right clinical setting this finding could reflect early pneumonia .