Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest views were obtained with patient in upright position . Comparison is made with the next preceding similar study of ___ . Appearance of heart size and mediastinal structures including thoracic aorta are unchanged and within normal limits . Pulmonary vasculature is not congested . No signs of acute or chronic pulmonary parenchymal infiltrates are present , and the lateral and posterior pleural sinuses remain free from any fluid accumulation . No pneumothorax in the apical area on frontal view . Skeletal structures of the thorax quite unremarkable .
    OUTPUT:
    
Stable normal chest findings , no evidence of active or latent tuberculosis in this patient with history of positive PPD .