Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest were obtained . Midline sternotomy wires , prosthetic cardiac valve are noted . There is a single - lead pacer projecting over the left axilla with lead tip extending into the expected location of the right ventricle . Lung volumes are low which somewhat limits the evaluation . There is no focal consolidation , effusion , or pneumothorax . Slight elevation of the left hemidiaphragm is noted . There are no definite signs of CHF . Cardiomediastinal silhouette appears grossly within normal limits . Bony structures appear intact .
    OUTPUT:
    
No acute intrathoracic process . Slight elevation of the left hemidiaphragm .