Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Blunting of the right costophrenic angle appears unchanged compared to prior . There is increased density at the left costophrenic angle , which may represent pleural effusion . The lungs are hyperinflated with underlying emphysematous changes . Linear opacity in the left mid-lung likely represents atelectasis . Heart and mediastinal contours are stable with a densely calcified aorta . No pneumothorax is detected . Mitral annular calcification is seen .
    OUTPUT:
    
Increased blunting of the left costophrenic angle , which may represent effusion or atelectasis .