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Reformatted CT scan of the skull show increased biparietal diameter and frontal bossing, and the anterior fontanel remains open and markedly enlarged in an adult patient. There was defective ossification of the mandibular menti (symphysis). In addition, there was persistence of the line of the 2 pieces of the mandible (persistent synchondrosis). Prognathism was marked associated with defective development of the upper jaw.
