Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright AP and lateral images are provided . The lung volumes are low with incomplete evaluation of the caridac silhouette . Bibasial atelectasis is seen . A hiatal hernia is noted . There is no pneumothorax or pleural effusion . Visualized osseous structures are unremarkable .
    OUTPUT:
    
No acute cardiopulmonary process .