Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In the interval since the prior study , there has been development of a right upper lobe opacity which while could represent infection , given underlying COPD , malignancy is not excluded . Again seen there is relative lucency of the upper lobe and interstitial prominence consistent with pulmonary emphysema . Left base linear opacity may be due to atelectasis / scarring . No large pleural effusion is seen . No evidence of pneumothorax . The cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Interval development of right upper lobe / right apical opacity , could represent infection , given underlying COPD / pulmonary emphysema , malignancy is not excluded . Findings could be further assessed on CT .