Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with ___ at 04 : 28 , the ET tube and NG tube have been removed . The cardiomediastinal silhouette is essentially unchanged , within normal limits . No CHF , focal infiltrate , or effusion is identified . Possible minimal atelectasis at the left base . No pneumothorax detected .
    OUTPUT:
    
Possible minimal atelectasis at left base . No focal opacity to suggest pneumonia .