Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes remain low , particularly in the left lung , where the lower lobe is collapsed . A small left pleural effusion is present . The heart border is obscured by parenchymal abnormalities . Hilar contours are stable . There is no pneumothorax .
    OUTPUT:
    
Left lower lobe collapse with a left pleural effusion , pneumonia can not be excluded .