Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mild to moderately enlarged . Atherosclerotic calcifications are noted at the aortic knob . Mediastinal contours unremarkable . There is crowding of the bronchovascular structures due to the presence of low lung volumes with possible mild pulmonary vascular congestion but no overt pulmonary edema . No focal consolidation , pleural effusion or pneumothorax is demonstrated . No acute osseous abnormalities seen .
    OUTPUT:
    
Possible mild pulmonary vascular congestion and low lung volumes . No focal consolidation .