Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is top normal . The hilar and mediastinal contours remain within normal limits . There is central vascular engorgement , without overt edema . Since ___ there is slight left volume loss with increased left retrocardiac opacity , likely reflecting atelectasis , though small consolidation at the left base can not be excluded . Moderate calcifications are again seen throughout the aortic arch . There is no pneumothorax or focal consolidation . A trace left pleural effusion is unchanged .
    OUTPUT:
    
Left basilar atelectasis appears worse since ___ . Small consolidation in this region can not be excluded . Trace left pleural effusion is unchanged .