Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiograph demonstrates a vague opacity projecting over the right upper lung not clearly identified on the lateral . Otherwise , lungs are clear without opacity . Cardiomediastinal and hilar contours are within normal limits . There is no evidence of pleural effusion , pneumothorax , or pulmonary edema . No air under the right hemidiaphragm is identified .
    OUTPUT:
    
Vague right upper lung opacity , potentially technical . Repeat PA suggested to ensure clearance .