Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is mild enlargement of the cardiac silhouette with a left ventricular predominance , unchanged . The mediastinal contours are unremarkable with aortic knob calcifications present . Streaky opacities at the lung bases likely reflect atelectasis . The pulmonary vascularity is not engorged . No pleural effusion , focal consolidation or pneumothorax is present . No acute osseous abnormality is visualized .
    OUTPUT:
    
Streaky opacities at the lung bases most likely reflective of atelectasis .