Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . Lungs are clear except for a linear focus of scar or atelectasis in the retrocardiac region . Pectus deformity results in hazy increased opacity adjacent to the right heart border on the frontal radiograph . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
No radiographic evidence of pneumonia