Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single upright portable view of the chest demonstrates a small left pleural effusion , with associated left basilar atelectasis , which has not significantly changed compared to prior studies . No evidence of pneumothorax , pulmonary edema or focal pneumonia . The cardiomediastinal silhouette is unremarkable .
    OUTPUT:
    
No acute cardiopulmonary process . Stable left pleural effusion and left basilar atelectasis .