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 . Analysis is performed in direct comparison with the next preceding similar study of ___ . The heart size remains within normal limits . No pulmonary vascular congestive pattern is identified . The previously identified prominence of the right - sided hilar structures has further progressed and extension into the central portion of the lower lobe area is noted . Aeration of the lung remains intact . There is no evidence of pleural effusion as the lateral pleural sinuses are free . No evidence of new pulmonary abnormalities in the left hemithorax which is superimposed by multiple small surgical clips apparently related to surgery . No pneumothorax is seen .
    OUTPUT:
    
Progression of central pulmonary densities previously identified by CT ( ___ ) as hilar adenopathy progressing into infrahilar area .