Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate a normal cardiac silhouette . There is increased opacity of the left upper lobe , with traction upon the trachea and left mainstem bronchus , consistent with the patient 's known neoplasm . No focal consolidation to suggest pneumonia is identified . Retrocardiac opacity likely represents atelectasis and a small left effusion . There is no pneumothorax . The visualized upper abdomen is unremarkable .
    OUTPUT:
    
1 . No focal consolidation to suggest bacterial pneumonia . 2 . Opacity of the left upper lobe with traction upon the trachea and left mainstem bronchus , consistent with known left upper lobe neoplasm and better evaluated on recent CT . 3 . Retrocardiac opacity likely represents atelectasis and a small amount of pleural fluid .