Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest views were obtained with patient in upright position . Analysis is performed in direct comparison with the next preceding chest examination of ___ . The heart size is normal and appears unchanged in comparison with the previous study . Thoracic aorta unremarkable . No mediastinal abnormalities are identified . The pulmonary vasculature is not congested . No signs of acute or chronic parenchymal infiltrates are present and the lateral and posterior pleural sinuses are free . No pneumothorax in the apical area . Skeletal structures of the thorax grossly within normal limits .
    OUTPUT:
    
Stable normal chest findings , thus no evidence of any pulmonary abnormalities in this patient on chronic medication for Crohn 's .