Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The aorta is moderately tortuous with patchy calcification . A perihilar opacity on the left does not appear particularly mass - like and would typically be more suggestive of pneumonia , involving the lingula and posterior basilar left lower lobe . There is a small pleural effusion on the right and a very small one on the left . Streaky opacities in the right hemithorax suggest chronic scarring . There is no pneumothorax . The bones appear demineralized . No fracture is identified .
    OUTPUT:
    
Left perihilar opacity that does not appear particularly mass - like , most suggestive of pneumonia based on imaging , although other etiologies such as atelectasis , chronic scarring or even aspiration could be considered , depending on clinical circumstances , if clinical findings do not suggest pneumonia . In any case follow - up radiographs are recommended within eigth weeks in order to show resolution and exclude the much less likely possibility of neoplasm . If available , correlation with prior radiographs would also be useful .