Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate normal cardiomediastinal silhouette . The lungs are clear . Previously seen left lower lobe pneumonia has significantly improved since preceding exam . There is no pneumothorax , vascular congestion , or pleural effusion .
    OUTPUT:
    
Interval resolution of lower lobe pneumonia since ___ . No acute cardiopulmonary process .