Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Semi upright portable AP chest radiograph demonstrates no air under the right hemidiaphragm . Lung volumes are low . No focal consolidation convincing for pneumonia is identified . Linear densities projecting over the right lower lung field is most compatible with linear atelectasis . There is no pleural effusion or pneumothorax . Visualized osseous structures demonstrate no acute abnormality .
    OUTPUT:
    
No air under the right hemidiaphragm is identified to suggest pneumoperitoneum . No acute intrathoracic abnormality is detected .