Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A small left pleural effusion is stable in size since ___ . Airspace opacity in the upper lobes , left greater than right , is new since the prior radiographs . No pneumothorax identified . Cardiac and mediastinal contours are stable .
    OUTPUT:
    
1 . New bilateral upper lobe airspace opacities , left greater than right , could represent hemorrhage and / or aspiration pneumonia . 2 . Stable small left pleural effusion .