Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild cardiomegaly is unchanged compared to the prior study . Aortic knob calcifications are again noted . The mediastinal and hilar contours are stable . Previously noted pattern of mild pulmonary vascular congestion has essentially resolved . Streaky opacity in the right lung base likely reflects atelectasis . No pleural effusion , focal consolidation or pneumothorax is identified . No acute osseous abnormality is seen .
    OUTPUT:
    
No definite evidence for congestive heart failure . Patchy streaky opacity in the right lung base likely reflects atelectasis though infection is difficult to exclude .