Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP view of the chest . Right IJ central venous line ends in the right brachiocephalic vein . Right mid lung and retrocardiac opacity are unchanged . No large pleural effusion . No pneumothorax . Heart size is normal . Median sternotomy wires and mediastinal clips are stable .
    OUTPUT:
    
Retrocardiac opacities could represent pneumonia . Right mid lung triangular opacity most consistent with atelectasis .