Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate unremarkable cardiomediastinal and hilar contours . Lungs are clear . No focal opacification concerning for pneumonia . No pleural effusion or pneumothorax . Dialysis catheter extends from the IVC into the right atrium . Dense tubular calcifications in bilateral upper extremities are likely due to renal failure and possible AV - fistula with additional vascular stent projecting over the left axilla .
    OUTPUT:
    
No acute cardiopulmonary process .