Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged . A large region of irregular opacification in the lingula is similar to the prior examination and most suggestive of scarring perhaps associated with a prior infection . There is a subpleural opacity at the lateral right lung apex which correlates with an irregular opacity on the prior CT . There is also a similar persistent opacity at the left lung apex centered in the parenchyma . Irregular lung architecture and relative lucency at the apices suggesting emphysema . There is no pleural effusion or pneumothorax . Bones appear demineralized .
    OUTPUT:
    
Markedly irregular opacification of the left mid lung as well as opacities at the lung apices , as seen previously , apparently chronic in nature with no definite radiographic finding suggestive of a superimposed acute process .