Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right PICC tip terminates in the proximal right atrium . There are low lung volumes . Mild cardiomegaly is unchanged . The aorta is tortuous and calcified , unchanged . The hilar contours are stable , and no pulmonary vascular congestion is noted . Patchy opacities within the lung bases have improved compared to the prior study , with residual interstitial opacity is in the left lung base likely reflective of atelectasis but infection is not excluded . No pneumothorax or pleural effusion is identified . There are multiple surgical ___ projecting over the left axilla .
    OUTPUT:
    
Improved aeration of the lung bases compared to the prior study . Residual patchy opacity within the left lung base may reflect atelectasis but infection can not be excluded .