Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is increased opacification in the lung bases on the frontal projection , left greater than right . Additionally , there is an opacity overlying the lower thoracic spine on the lateral . Given the clinical history , findings are concerning for acute pneumonia . There are no pleural effusions . There is mild hyperinflation of the lungs with flattening of the hemidiaphragms , suggestive of underlying obstructive pulmonary disease . No pneumothorax is evident . There is no pulmonary edema . Mediastinal and hilar contours are within normal limits . The heart size is at the upper limits of normal .
    OUTPUT:
    
Bibasilar opacities , left greater than right , concerning for acute pneumonia given the clinical history .