Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . No focal consolidation , pleural effusion , or evidence of pneumothorax is seen . Right paratracheal opacity likely represents vascular structures and is unchanged since at least ___ . Cardiac and mediastinal silhouettes are stable . The aortic knob remains calcified . No overt pulmonary edema is seen .
    OUTPUT:
    
No significant interval change .