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[Hemi-occipitalisation of the atlas in a Merovingian of the early Middle Ages (author's transl)].

A case of hemi-occipitalisation of the atlas is reported which appears to be the oldest case presently described in a Merovingian of the early Middle Ages, whose skeleton was discovered in 1974. This partial assimilation of the atlas was associated with marked hypoplasia of the basioccipital region producing a deep basilar depression.