Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs clear . Cardiac silhouette is unremarkable . Aorta is tortuous but unchanged . There is no pleural effusion , pneumothorax , pulmonary edema . Blunting of the costophrenic angles on the lateral radiograph is due to atelectasis as demonstrated on the recent chest CT .
    OUTPUT:
    
No evidence of acute cardiothoracic process .