Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and CABG . The cardiac and mediastinal silhouettes are stable . Previously seen right - sided PICC is no longer seen . Right lower lobe opacity has increased since the prior study . No large pleural effusion is seen . There is no evidence of pneumothorax .
    OUTPUT:
    
Increased right lower lobe opacity , with differential diagnosis due to worsening atelectasis or consolidation due to infection or aspiration .