Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiograph demonstrates a right porta cath tip in the lower SVC , unchanged in appearance since previous examination . Intact median sternotomy wires as well as a prosthetic aortic valve are noted . The lungs are moderately well expanded and clear . No focal opacity . No pleural effusion or pneumothorax . Heart size , mediastinal contour , and hila are unremarkable .
    OUTPUT:
    
No radiographic evidence of pneumonia .