Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest has been obtained with patient in sitting semi-upright position . The heart size is normal . No configurational abnormality is seen . Thoracic aorta mildly widened and elongated , but no local contour abnormalities or wall calcifications are present . The pulmonary vasculature is not congested . No signs of acute or chronic parenchymal infiltrates are seen and the lateral pleural sinuses are free . No evidence of pneumothorax in the apical area . Skeletal structures grossly unremarkable . Our records do not include a previous chest examination available for comparison .
    OUTPUT:
    
AP single view chest examination without evidence of cardiac enlargement , pulmonary congestion or pneumonic infiltrates .