Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright chest radiograph was obtained . There is no focal consolidation , pleural effusion or pneumothorax . There is no free air under the right hemidiaphram . Lucency under the left hemidiaphragm is most likely due to a distended stomach . Cardiomediastinal silhouette is unchanged and notable for a tortuous thoracic aorta . Linear opacity at the left lung base is likely atelectasis . Bony structures are intact .
    OUTPUT:
    
1 . No acute intrathoracic abnormality . Lucency under the left hemidiaphragm is likely a distended stomach rather than free air . If there is clinical concern , recommend repeat radiograph in a few hours . 2 . Atelectasis at the left lung base .