Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Tracheostomy tube is no longer visualized . Lung volumes are relatively low with crowding of the bronchovascular markings and left basilar atelectasis . There is no definite superimposed consolidation or edema . Cardiomediastinal silhouette is within normal limits . Prosthetic valve and median sternotomy wires are again noted . Catheter projects over the right neck and chest wall .
    OUTPUT:
    
No definite acute cardiopulmonary process .