Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates low lung volumes . In the setting of the low lung volumes , there is minimal increase in density of the parenchyma at the left base , with a morphology more consistent with atelectasis . The cardiomediastinal and hilar contours are unremarkable . No pleural effusion or pneumothorax .
    OUTPUT:
    
Minimal increased density of the parenchyma at the left base likely consistent with atelectasis .