Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are fully expanded and clear . The appearance of a cavity in the lateral lower left lung is likely simulated by the superior border of an anterior read and a possible loculated adjacent effusion . Small dependent left pleural effusion is likely unchanged . Moderate cardiomegaly is unchanged . Cardiomediastinal hilar silhouettes are unremarkable . A fiducial seed near the right hilus is noted .
    OUTPUT:
    
Small left pleural effusion .