Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild cardiomegaly is stable compared to the prior exam . There are no definite signs of pulmonary edema or vascular engorgement . There is no evidence of large pleural effusion or pneumothorax . Linear opacities in the retrocardiac region are likely secondary to atelectasis . There is no evidence of pneumothorax . The visualized osseous structures are unremarkable .
    OUTPUT:
    
Linear opacities in the retrocardiac region likely secondary to atelectasis . No evidence of pulmonary edema .