Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: No focal consolidation or pleural effusion is identified . There is a persistent lucency projecting over the peripheral right lung base which may reflect the basal pneumothorax . The right apical pneumothorax is not definitively identified . The size of the cardiac silhouette is within normal limits . There is mild unfolding of the thoracic aorta .
    OUTPUT:
    
Unchanged lucency at the right lung base likely reflects a basal pneumothorax . No discernible right apical pneumothorax is identified .