Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Large left upper lobe opacity worrisome for left upper lobe mass , with underlying atelectasis / collapse . There is a small left pleural effusion . No right pleural effusion is seen . There is no evidence of pneumothorax . The cardiac silhouette is top - normal in size . No pulmonary edema is seen .
    OUTPUT:
    
Large left upper lobe opacity worrisome for mass with underlying left upper lobe atelectasis / collapse . Small left pleural effusion .