Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are within normal limits . There is atelectasis at the left lung base . Otherwise , no focal consolidations concerning for pneumonia are identified . There are no pleural effusions , pneumothorax or pulmonary edema . Visualized osseous structures are grossly unremarkable .
    OUTPUT:
    
No radiographic evidence of an acute cardiopulmonary process .