Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right pleural effusions essentially resolved . The left pleural effusion , if present , is minimal . Significant improvement in left lower lung atelectasis , with mild residual atelectasis and persistent elevation of left hemidiaphragm and slight leftward shift of the mediastinum . Interval improvement in the edema . Mild cardiomegaly is overall unchanged . Median sternotomy wires are intact . No pneumothorax . Mild bilateral apical pleural thickening is unchanged .
    OUTPUT:
    
Mild left lower lung atelectasis .