Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Opacification in the right hilar region and right upper lobe corresponds to known of malignancy , better assessed on the previous PET - CT with associated postobstructive changes . In the interval , there is new development of a moderate right pleural effusion . Heart size is difficult to assess given the presence of the right - sided pleural effusion . Abnormal widened mediastinal contour is unchanged and compatible with underlying lymphadenopathy . Left lung is clear without pleural effusion . No pneumothorax is identified . Pulmonary vasculature is not engorged .
    OUTPUT:
    
Interval development of moderate size right pleural effusion . Right upper lobe and hilar opacification compatible with known malignancy with postobstructive changes . Mediastinal lymphadenopathy , better assessed on recent PET - CT .