Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view portable chest x-ray in upright position shows reduced lung volume with new linear opacities at the lung bases , compatible with linear atelectasis . There is no consolidation or nodules suspicious for pneumonia . Cardiomediastinal silhouette is unchanged and normal . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Linear atelectasis at the lung bases , but without signs of pneumonia . Findings were reported to nursing care at 4 :21 p .m . by Dr . ___ .