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agenesis |
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agenesisFailure of all or part of an organ to develop during embryonic growth. Many forms of agenesis are lethal, such as absence of the entire brain (anencephaly), but agenesis of one organ of a pair may cause little problem. Agenesis of a kidney, bladder, testicle, ovary, thyroid, and lung are known. Agenesis of the arms or legs is called meromelia (absence of one or both hands or feet), phocomelia (normal hands and feet but no arms or legs), and amelia (complete absence of a limb or limbs). Agenesis may be caused by absence of embryonic tissue or by chemical exposure in the uterus, and it is often associated with other congenital disorders. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| ? Mentioned in | ? References in periodicals archive | |
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| Maternal-fetal transfer of
thyroxine in congenital hypothyroidism due to a total organification
defect or thyroid agenesis. (21,22) A well-known example of GS is persistent mirror
movements found among patients exhibiting agenesis of the corpus
callosum. MRI is also the best method for identifying intracranial
anomalies associated with meningoencephalocele: holoprosencephaly,
DandyWalker malformation, aqueductal stenosis, agenesis of the corpus
callosum, and other midline abnormalities. |
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