Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Linear opacities at the bilateral bases are unchanged from the prior exam , and most consistent with scarring . The lungs are otherwise clear without a focal airspace consolidation to suggest pneumonia . There is no pulmonary edema , pleural effusion , or pneumothorax . The mediastinal contours are normal . The heart is mildly enlarged , and unchanged from the prior exam .
    OUTPUT:
    
No acute cardiopulmonary process ; specifically , no evidence of pneumonia .