Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral views of the chest . Low lung volumes areseen . Right - sided dual - lumen central venous catheter seen in unchanged position . The lungs are clear without consolidation , effusion are in pulmonary vascular congestion . Cardiomediastinal silhouette is within normal limits given low inspiratory effort . Possible hiatal hernia identified on lateral view . No acute osseous abnormality identified . Degenerative changes again seen at the acromioclavicular joint .
    OUTPUT:
    
No acute cardiopulmonary process .