#neural tube defect

• Amyelia — An extremely rare and severe congenital malformation within the neural tube defects spectrum, characterized by the total absence or complete developmental arrest of the spinal cord. This severe structural anomaly occurs during the first weeks of embryogenesis due to the failure of the posterior neuropore to close, being incompatible with extrauterine life and often associated with other major cranial malformations.
• Anencephalic — A medical term describing a fetus, newborn, or individual affected by anencephaly, a severe congenital malformation characterized by the partial or total absence of the brain, meninges, and skull bones. As an adjective, it refers to any biological structure or organism exhibiting this profound developmental defect of the anterior neural tube.
• Anencephalic — The feminine form of 'anencefal'; describing an organic structure, a pregnancy, or a female biological entity characterized by the total or partial congenital absence of the brain and cranial vault. The term is frequently utilized in medical imaging and obstetrics to qualify severe malformations detected during fetal morphology scans.
• Anencephalic — Pertaining to anencephaly or relating to this severe congenital malformation; characteristic of an organism partially or totally lacking a brain and the bony elements of the cranial vault. The term clinically, structurally, or pathologically describes the manifestations and tissues associated with this major neural tube defect.
• Anencephaly — An extremely severe, lethal congenital malformation characterized by the total or partial absence of the cerebral hemispheres, cerebellum, and cranial vault, caused by the failure of the anterior neuropore to close during embryogenesis (days 23-26). This major structural condition is incompatible with long-term survival, with most cases resulting in stillbirth or death shortly after birth.