Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest views were obtained with patient in upright position . The heart size is stable and within normal limits . Thoracic aorta unremarkable . No mediastinal abnormalities are present . The pulmonary vasculature is not congested . The lungs are free and no evidence of acute infiltrates is present . When comparison is made with the previous two studies , at that time identified left lower lobe changes in the posterior segment consistent with early developing pneumonia can not be identified anymore and the chest findings are now unremarkable .
    OUTPUT:
    
Resolution of previously identified left lower lobe pneumonic infiltrates .