Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is upper limits of normal in the thoracic aorta is tortuous . The pulmonary vasculature is normal . Lungs are clear except for linear bibasilar areas of atelectasis . . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Linear bibasilar atelectasis . No evidence of pneumonia .