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Anencephaly is the absence of a major portion of the brain, skull, and scalp that occurs during embryonic development. [1] It is a cephalic disorder that results from a neural tube defect that occurs when the rostral (head) end of the neural tube fails to close, usually between the 23rd and 26th day following conception. [ 2 ]
Causes: Genetic and ... Spina bifida is a type of neural tube defect related to but distinct from other types such as anencephaly ... Children and adults with spina ...
Failure of closure of the anterior neuropore during embryogenesis will lead to anencephaly, the failure of the brain and skull to develop.In less severe situations it may lead to different forms of encephalocele (i.e. cranium bifidum).
The cause of hydranencephaly is not clear. Hydranencephaly is a result of an injury of the nervous system or an abnormal development of the nervous system. The neural tube closes in the sixth week of the pregnancy, [15] so hydranencephaly develops during these weeks of the pregnancy. The cause of these injuries/development is not clear. [16]
Encephaloceles are often accompanied by craniofacial abnormalities or other brain malformations. Symptoms may include neurologic problems, hydrocephalus (cerebrospinal fluid accumulated in the brain), spastic quadriplegia (paralysis of the limbs), microcephaly (an abnormally small head), ataxia (uncoordinated muscle movement), developmental delay, vision problems, mental and growth retardation ...
Hyperthermia causes anencephaly, which is when part of the brain and skull are absent in the infant. [61] [68] Mother exposure to toxoplasmosis can cause cerebral calcification, hydrocephalus (causes mental disabilities), [69] and intellectual disability in infants. Other birth abnormalities have been reported as well, such as chorioretinitis ...
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A mother holding her son who was born with microcephaly due to vertically transmitted infection with Zika virus. Microcephaly (from Neo-Latin microcephalia, from Ancient Greek μικρός mikrós "small" and κεφαλή kephalé "head" [2]) is a medical condition involving a smaller-than-normal head. [3]