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 . No previous chest examination is available for direct comparison . The heart size remains within normal limits paying attention to portable technique . No configurational abnormality is identified . Thoracic aorta mildly widened and elongated but not excessive considering patient 's age . The pulmonary vasculature is not congested . No signs of acute or chronic parenchymal infiltrates are present and the lateral pleural sinuses are free . There exists no prior chest examination available for comparison .
    OUTPUT:
    
No evidence of pneumonia on portable AP single chest view examination .