Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate normal heart size and unremarkable mediastinal and hilar contours . A subsegmental atelectasis in the left lower lobe is decreased since prior exam . A small left pleural effusion is also slightly improved with mild persistent left basilar atelectasis . The lung volumes are persistently low . There is no pneumothorax or vascular congestion .
    OUTPUT:
    
Improving small left pleural effusion and subsegmental atelectasis in the left lower lobe .