Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size and cardiomediastinal contours are normal . Vague nodular and streaky opacities in the left lower lung are nonspecific , possibly represent early infection or bronchial mucoid impaction . No pleural effusion or pneumothorax .
    OUTPUT:
    
Subtle left lower lung opacities may represent early pneumonia vs mucoid impaction .