Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest views were obtained with patient in upright position . Analysis is performed in direct comparison with the next preceding similar study of ___ . The patient has a history of previous bypass surgery . Sternal wires had to be removed related to necrotic processes in the sternum requiring removal of manubrium . Multiple surgical clips can still be identified in the anterior mediastinum and along the anterior left - sided chest wall . There is very mild cardiac enlargement postoperatively and apparently unchanged in comparison with the next previous available examination of ___ . The pulmonary vasculature is not congested and there is no evidence of any acute pulmonary infiltrate . Very mild blunting of the lateral pleural sinuses is present , seen on the frontal views , but apparently unchanged since ___ . The lateral pleural sinuses are free . One can , however , identify a few linear and patchy infiltrates in the left lower lung base , lateral and posteriorly , which are slightly more prominent than they were ___ years ago . It is impossible to decide whether they represent scar formations or to some degree represent infectious processes . It is recommended to treat the patient for the ongoing infection and schedule him for a followup examination in about two to three weeks .
    OUTPUT:
    
Grossly unchanged chest findings . probably old scar formations , possibly with some subtle new infiltrates on the left base . Followup examination after two to three weeks is recommended .