Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart is upper limits of normal in size in the aorta is mildly tortuous . Lungs are clear except for subsegmental atelectasis in the mid and lower lungs . There are no pleural effusions .
    OUTPUT:
    
Multifocal subsegmental atelectasis . Coexisting aspiration or pneumonia lung bases is difficult to fully excluded radiographically .