| iniencephaly | Malformation consisting of a cranial defect at the occiput, with the brain exposed; often in combination with a cervical rachischisis and retroflexion. Origin: G. Inion, back of the head, + enkephalos, brain (05 Mar 2000) |
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| iniencephaly |
a developmental anomaly characterized by enlargement of the foramen magnum and absence of the laminal and spinous processes of the cervical, dorsal, and sometimes lumbar vertebrae, with vertebrae reduced in number and irregularly fused, the brain and much of the spinal cord occupying a single cavity.
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