Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been previous median sternotomy , with disruption and displacement of multiple sternal wires , unchanged from the prior radiograph but most consistent with chronic sternal dehiscence . Unchanged widening of cardiomediastinal contours likely reflects a combination of mild cardiomegaly and diffuse mediastinal lipomatosis . Lungs are clear exceot fir focal linear scar versus atelectasis at the right lung base . Unchanged blunting of right lateral costophrenic sulcus may reflect pleural thickening or pleural scarring . Bones are diffusely demineralized , and note is made of compression deformities in the imaged portion of the spine , not substantially changed since ___ .
    OUTPUT:
    
1 . Findings suggestive of chronic sternal dehiscence . 2 . Right basilar pleural and parenchymal scarring , with or without coexisting small right pleural effusion .