Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral radiographs of the chest demonstrate clear lungs . There are bilateral nipple shadows overlying the lower lung fields , which should not be confused with an intrapulmonary process . There is no pneumothorax or pleural effusion . The hila and cardiomediastinal contours are normal . Pulmonary vascularity is normal . Callus formation around the posterior left eighth rib is consistent with remote history of fracture . Cholecystectomy clips can once again be seen in the right upper quadrant of the abdomen .
    OUTPUT:
    
No evidence of pneumonia .