Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Pectus excavatum deformity of the sternum likely accounts for the hazy opacity at the medial right lung base . There are no convincing signs of pneumonia , CHF , effusion , or pneumothorax . The heart and mediastinal contours are normal . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
No signs of pneumonia . Pectus excavatum deformity of the sternum .