Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: ET tube tip is 1 cm from the carina . Low lung volumes are noted . Retrocardiac opacity may be due to secondary atelectasis although underlying effusion or consolidation is possible . The cardiomediastinal silhouette is unchanged . Dense mitral annular calcifications are again seen . Severe degenerative changes identified at the shoulders .
    OUTPUT:
    
ET tube tip 1 cm from the carina .