The MLO view shows the parenchymal distortion related to previous surgery. It's high up in the breast and on cc view, this is always a difficult area to include on the conventional cc image.
The second image is an extended cc view (xcc). It is a very handy tool to illustrate specifically a lesion high up in the breast as the one illustrated. It shows the whole area. You need to see the whole area of scarring in order to say it is not suspicious. Do not be tempted to accept an image where the scar is suboptimally imaged.