Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Linear opacities in the bilateral lower lobes most likely represent atelectasis . The lung volumes are low and there is no focal consolidation , pleural effusion or pneumothorax . The cardiac and mediastinal contours are stable . There is no free air beneath the hemidiaphragms .
    OUTPUT:
    
No acute cardiopulmonary process , specifically no free intraperitoneal air .