Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate cardiomegaly is unchanged . Widening of the mediastinum is stable to improved when compared to ___ study . Right apical pneumothorax is grossly unchanged . Lung volumes are low . Substantial subsegmental atelectasis of the lower left lobe persists . No pleural effusions are seen .
    OUTPUT:
    
Stable right apical pneumothorax and substantial left lower subsegmental atelectasis .