[Bone within bone of the vertebral body]

The finding of a small vertebral body inside one or more vertebral bodies is not commonly observed even if it is present in many conditions, but it lacks both a systemic description and an interpretative evaluation. After examining different radiological aspects we tried to find out their meaning which is explained by three different possible patterns: a physiological pattern in the newborn; a dystrophic pattern due to failure in prowing; and last a strengthening and support for the reduced resistance of the bone.