Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Large pleural left - sided central venous catheter is again seen , grossly unchanged in position . A right - sided single lead pacemaker is also as stable in position . Left base opacity with obscuration of the diaphragm likely due to pleural effusion with overlying atelectasis . Left base consolidation may also be present . There is also patchy opacity in the right infrahilar region although somewhat similar as compared the prior study and most likely represents overlap of vascular structures . The cardiac and mediastinal silhouettes are stable . No pneumothorax is seen .
    OUTPUT:
    
Left base opacity worrisome for pleural effusion and atelectasis although consolidation due to pneumonia may be present .