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 examinations of ___ and ___ . The heart size is within normal limits . No typical configurational abnormality is seen . Thoracic aorta stable . No new contour abnormalities identified . Mediastinal structures unremarkable . The previously identified bilateral fullness of the hilar regions as well as the markedly increased interstitial structures in both lungs has now undergone marked improvement . Whereas comparison between the previous examinations of ___ and ___ could not demonstrate a conclusive improvement , the present examination shows almost complete normalization of the previously increased interstitial markings . Also fullness of the hilar regions observed and commented upon previously has clearly regressed . No evidence of new abnormalities . No signs of pleural effusion and no pneumothorax in the apical area . Review of chest CT of ___ illustrated well , the at that time rather advanced interstitial and peripheral parenchymally seen nodular densities .
    OUTPUT:
    
Marked improvement of diffuse sarcoid changes seen on PA and lateral chest examination during the latest six-month examination interval .