Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette and mediastinum are normal . There is some atelectasis at the left lung base . The vascular markings are normal . There are no pneumothoraces . Bony structures are intact . There is some eventration of the left hemidiaphragm . There are degenerative changes of the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary process .