Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . The right lung is clear . Subtle patchy left base opacity is felt to most likely be due to vascular structures and / or atelectasis , less likely consolidation . The cardiac , mediastinal , hilar contours are unremarkable . No overt pulmonary edema is seen . No evidence of free air is seen beneath the hemidiaphragms .
    OUTPUT:
    
1 . No evidence of free air beneath the hemidiaphragms . 2 . Subtle patchy left base opacity most likely represents combination of vascular structures and atelectasis , less likely consolidation .