Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left - sided pacemaker and ICD , sternal wires , and mediastinal clips are in unchanged position . A linear opacity in the left mid lung zone is unchanged from multiple exams dating to ___ , likely representing chronic scarring . There is no new opacity to suggest pneumonia . There is no pulmonary edema , pleural effusion , or pneumothorax . The mediastinal contours are normal . The heart size is moderately enlarged , and unchanged .
    OUTPUT:
    
Unchanged left mid lung zone scarring . No evidence of pneumonia . Results were discussed with Dr . ___ assistant at 3 :30 PM on ___ via telephone by Dr . ___ .