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acrania
Acrania is a rare congenital disorder that occurs in the human fetus in which the flat bones in the cranial vault are either completely or partially absent. The cerebral hemispheres develop completely but abnormally.〔 The condition is frequently, though not always, associated with anencephaly. The fetus is said to suffer from acrania if it meets the following criteria: the fetus should have a perfectly normal facial bone, a normal cervical column but without the fetal skull and a volume of brain tissue equivalent to at least one third of the normal brain size.〔(Acrania: review of 13 cases ) - Tae-Hee Kwon, MD
*, Jim King, MD, Philippe Jeanty, MD, PhD〕
==Diagnosis==
Acrania can be diagnosed early in pregnancy through an ultrasound. This anomaly appears during the beginning or end of the fourth week of the fetus's development. An absence of the skull is needed in order to make a diagnosis. A presence of brain tissue will confirm the diagnosis of Acrania and differentiate it from other developmental problems such as Anencephaly.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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