End stage of the progressive anterior vertebral fusion and the multi-level anterior fusion with disc space obliteration (T1-T5). There is a massive bony ridge extending anteriorly and in some vertebrae, posteriorly as well. However, (arrow b) note the sparing of the disc space posteriorly, whereas the anterior end plate is totally obliterated (arrow a). Absence of the normal concavity of the anterior body surface. There is a proliferation of sclerotic bone.