Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Endotracheal tube tip is approximately 5 .2 cm from the carinal . There is progression of a now dense retrocardiac opacity silhouetting the medial hemidiaphragm . Elsewhere , the lungs are clear . The cardiomediastinal silhouette is within normal limits for technique . Anterior cervical spine fixation hardware is identified . Median sternotomy wires are also noted .
    OUTPUT:
    
ET tube 5 .2 cm from the carina . Worsening retrocardiac opacity potentially atelectasis although aspiration or pneumonia are possible .