Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right - sided pleural effusion has not significantly changed with fluid along the major fissure . The small right apical pneumothorax is not seen . The pulmonary vessels have decreased in size . The cardiac silhouette remains enlarged . The left lung is essentially clear now , with resolution of the atelectasis . There is barium within the left colon .
    OUTPUT:
    
Interval improvement of pulmonary vascular congestion and left basal atelectasis . The right pleural effusion has not significantly changed .