Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable . The lungs appear clear . A consolidation in the left upper lobe , seen on the prior study , has fully resolved . There is a trace pleural effusion on the right , but no clearly convincing one on the left . There is no pneumothorax .
    OUTPUT:
    
Trace suspected left - sided pleural effusion , or possibly atelectasis in the posterior costophrenic angle ; otherwise unremarkable study .