Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable semi-erect frontal chest radiograph demonstrates mildly hypoinflated lungs with persistent right mid lung platelike atelectasis . New retrocardiac opacity is present . No pleural effusion or pneumothorax . Heart size , mediastinal contour , and hila are unremarkable . Limited assessment of the upper abdomen is within normal limits . Lower cervical fusion hardware device is unchanged . Evidence of subacute or chronic right posterolateral 6 and 7 rib fractures .
    OUTPUT:
    
1 . New retrocardiac opacity is worrisome for pneumonia or aspiration pneumonia . 2 . Hypoinflated lungs with persistent right mid lung platelike atelectasis .