Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size remains mildly enlarged . The mediastinal and hilar contours are within normal limits . Pulmonary vasculature is normal . Small left pleural effusion is demonstrated along with patchy opacities the lung bases . No pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Small left pleural effusion . Patchy opacities in the lung bases likely reflect areas of atelectasis , but aspiration or infection can not be excluded in the correct clinical setting .