Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest demonstrate lungs . There is mild blunting of the left costophrenic angle , which likely represents atelectasis , and is unchanged . There is a subtle opacity in the right middle lung field which may represent a composite shadow , however underlying parenchymal abnormality can not be excluded . The cardiac and mediastinal contours are unchanged from the prior radiograph . No pneumothorax or pleural effusion is seen .
    OUTPUT:
    
No acute cardiopulmonary process . Can not exclude underlying nodule in the right middle lung field subtle opacity . Recommend repeat radiograph for further evaluation .