Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal , and hilar contours appear unchanged . There are vague right mid lung opacities , which are for the most part fairly similar to the prior study , although with an increase in the left suprahilar region . There is no pleural effusion or pneumothorax . There are mild degenerative changes along the thoracic spine .
    OUTPUT:
    
Increased left suprahilar opacity , which would be compatible with alveolar proteinosis , although not specific .