Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no pleural effusionor pneumothorax . Patchy opacities at the lung bases may reflect atelectasis . Heart is normal in size . The mediastinal and hilar structures are unremarkable . Nonspecific air - fluid levels in the abdomen are incompletely evaluated , however , there is no evidence for obstruction . No free air beneath the diaphragms .
    OUTPUT:
    
Patchy bibasilar opacities , likely atelectasis although infection is not completely excluded .