Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The hilar and mediastinal contours are normal . The lungs are clear without evidence of focal consolidations concerning for pneumonia . There is increased flattening along the left hemidiaphragm on the lateral radiograph , which may represent an interval increase in moderate left pleural effusion . There is no pneumothorax . The visualized osseous structures are unremarkable .
    OUTPUT:
    
1 . No acute intrathoracic abnormalities identified . 2 . Interval increase in moderate left pleural effusion .