Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . The cardiac and mediastinal silhouettes are stable with mild to moderate cardiomegaly and a calcified tortuous aorta . There is minimal pulmonary vascular congestion , improved since the prior study . Subtle patchy left base retrocardiac opacity most likely represents atelectasis . No definite focal consolidation is seen . No pleural effusion or pneumothorax .
    OUTPUT:
    
Possible minimal pulmonary vascular congestion , improved since the prior study . Otherwise no significant interval change . Persistent cardiomegaly .