Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left PICC tip terminates within the proximal right atrium . The patient is status post median sternotomy and mitral valve replacement . Heart size remains moderately enlarged with left atrial and left ventricular calcifications again noted . Mild pulmonary vascular congestion with cephalization is similar compared to the prior study . Small bilateral pleural effusions are not substantially changed in the interval . Patchy opacity within the left lung base may reflect atelectasis . No pneumothorax is present .
    OUTPUT:
    
Mild pulmonary vascular congestion , small bilateral pleural effusions , and mild left basilar atelectasis .