Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is persistent elevation of the left hemidiaphragm with opacity of the left hemithorax and elevation of the left mainstem bronchus and a stable Luftsichel sign , consistent with continued left upper lobe collapse although the volume of the collapsed lobe and the large central mass have mass have both decreased since ___ . Right basilar atelectasis is noted and there could be a small metastatic nodule . There is no radiographic evidence of pneumonia , though evaluation on recent CT is more specific . The cardiac silhouette and pulmonary vasculature are unremarkable and unchanged since the prior examinations . No definite pleural effusion or pneumothorax identified .
    OUTPUT:
    
Persistent left upper lobe collapse without evidence of pneumonia . Decreasing mass , left hilus and left upper lobe . Possible pulmonary metastasis , right lower lobe . This examination neither suggests nor excludes the diagnosis of pulmonary embolism .