Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP semiupright and lateral chest radiographs were obtained . The lungs are low in volume with linear left basilar atelectasis . There is no focal consolidation , pleural effusion or pneumothorax . The heart is at most top normal in size allowing for AP technique and low lung volumes . Mediastinal and hilar contours are unremarkable .
    OUTPUT:
    
No acute intrathoracic process .