Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Small left pleural effusion and mild basal atelectasis are unchanged . The lungs are without consolidation . Cardiomediastinal silhouette remains stable at the upper limits of normal . ___ denote prior upper abdominal surgery .
    OUTPUT:
    
Stable small left pleural effusion and basal atelectasis . No acute cardiopulmonary process .