Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval marked decrease in now small left pleural effusion after thoracentesis . There is no pneumothorax . There is elevation of the left hemidiaphragm . Left lower lobe opacities could be remaining atelectases but other pathology can not be totally excluded attention in followup is recommended . Cardiomediastinal structures are midline
    OUTPUT:
    
Decrease in left pleural effusion . No pneumothorax . Remaining opacities in the left base attention in followup is recommended