Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate mild enlargement of the cardiac silhouette , stable compared to the prior studies . Mediastinal contour is otherwise unremarkable . Pacemaker projects over the left anterior chest and calcifications are again seen within the aortic arch . Lungs are well expanded . Linear streaky opacity in the left lower lung is likely due to atelectasis . There is no pulmonary edema . No pleural effusions and no pneumothorax .
    OUTPUT:
    
Linear streaky opacity in the left lower lung is likely due to atelectasis . No definite evidence of pneumonia or pulmonary edema .