Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable AP upright chest radiograph demonstrates new left perihilar opacities worrisome for pneumonia . The remainder of the left hemi thorax and right lung appear clear . Cardiomediastinal and hilar contours are within normal limits allowing for low lung volumes . There is no pleural effusion , pneumothorax , or evidence of pulmonary edema .
    OUTPUT:
    
Left perihilar opacity , worrisome for pneumonia .