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[Iniencephaly: four cases and a review of the literature].

Iniencephaly is a rare malformation of the base of the skull. The brain is involved and prognosis is almost invariably lethal. We identified 202 reports in the literature up through 2000. Ultrasound morphology explorations now provide the diagnosis making it possible to propose pregnancy termination. We report four cases of iniencephaly diagnosed between 1992 and 1999.