Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . Lung volumes remain low . Heart is normal in size . Cardiomediastinal contours are unremarkable . Lungs are clear . There is no pleural effusion or pneumothorax . A linear density at the left base likely reflects mild atelectasis .
    OUTPUT:
    
No acute intrathoracic abnormality .