Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Decreased left pleural effusion with improvement in left basilar atelectasis . Normal cardiomediastinal and hilar contours . Lungs are clear . No acute pneumonia or pneumothorax . Degenerative thoracic spine disease .
    OUTPUT:
    
Minimal , residual left pleural effusion with underlying atelectasis .