Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral images of the chest . The lungs are well expanded . Opacity at the left lung base likely represents atelectasis . There is cephalization of the pulnoary vasculature without evidence of edema . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is moderate cardiomegaly , increased from prior exam .
    OUTPUT:
    
1 . No acute cardiopulmonary process . 2 . Moderate cardiomegaly , increased from prior exam . 3 . Cephalization of the pulnoary vasculature without evidence of edema .