Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged but unchanged . The mediastinal and hilar contours are stable . Pulmonary vasculature appears mildly indistinct suggestive of mild pulmonary vascular engorgement . Linear and patchy bibasilar atelectasis is noted in the lung bases without focal consolidation . No pleural effusion or pneumothorax is identified . Punctate calcification in the left apex may be vascular in origin . There are no acute osseous abnormalities .
    OUTPUT:
    
Bibasilar atelectasis and probable mild pulmonary vascular engorgement .