Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is rotated and there are low lung volumes . There is minimal atelectasis at the bases but there is no evidence of pulmonary edema . There is no pneumothorax or pleural effusion . There is a widened mediastinal silhouette , unchaged from prior exam .
    OUTPUT:
    
Minimal atelectasis . Stable widened mediastinum . No acute cardiopulmonary process .