Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are mildly hypoinflated . Right lung is clear . New small left pleural effusion . No focal opacity . Top normal heart size . Mediastinal contour and hila are otherwise unremarkable . Limited assessment of upper abdomen is unremarkable .
    OUTPUT:
    
New small left pleural effusion . No evidence of pneumonia . Of note subtle infection may only be seen on CT scan .