Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low which limits evaluation . There is no large opacity , pulmonary edema , pleural effusion or pneumothorax . The cardiac and mediastinal silhouettes are stable accounting for differences in technique . There is no free air beneath the right hemidiaphragm .
    OUTPUT:
    
No overt signs signs of pneumonia or congestive heart failure .