Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs were obtained . There is no pneumothorax . The small region of opacification at the base of the left lung has essentially cleared . A tiny left pleural effusion is stable . Normal postoperative cardiomediastinal silhouette .
    OUTPUT:
    
No pneumothorax . Lungs are clear , with persistent tiny left pleural effusion .