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 examination of ___ . Heart size , mediastinal structures , and the aorta are unchanged . No pulmonary vascular congestion is noted . The previously identified density with atelectatic character in the periphery of the left upper lobe lingula persists . There may be a mild improvement ; however , significant amount of density of the peripheral parenchyma remains particular well illustrated on the lateral view . No other new abnormalities are identified .
    OUTPUT:
    
Pneumonic infiltrates with rather slow resolution . It is recommended to perform a further followup in about two weeks , and if no satisfactory resolution has been obtained , then we would have to consider to perform a chest CT to evaluate for a centrally located bronchial obstruction .