Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . A streaky right lower lung opacification suggest minor atelectasis , but otherwise the lungs appear clear . There is no pleural effusion or pneumothorax . Calcified chondroid matrix is partly visualized in the proximal right humerus consistent with an enchondroma .
    OUTPUT:
    
1 . No evidence of acute disease . 2 . No evidence of free air . 3 . Enchondroma in the proximal right humerus .