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Frequency. 1 in 4600 in the U.S. 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 ...
Medical genetics. Holoprosencephaly ( HPE) is a cephalic disorder in which the prosencephalon (the forebrain of the embryo) fails to develop into two hemispheres, typically occurring between the 18th and 28th day of gestation. [ 1] Normally, the forebrain is formed and the face begins to develop in the fifth and sixth weeks of human pregnancy.
Definition. A late termination of pregnancy often refers to an induced ending of pregnancy after the 20th week of gestation, i.e. after a fetal age (time since conception) of about 18 weeks. The exact point when an abortion is considered late-term, however, is not clearly defined.
Acalvaria. Acalvaria. Specialty. Medical genetics. Acalvaria is a rare malformation consisting of the absence of the calvarial bones, dura mater and associated muscles in the presence of a normal skull base and normal facial bones. The central nervous system is usually unaffected. The presumed pathogenesis of acalvaria is the faulty migration ...
Carpal tunnel syndrome – Carpal tunnel syndrome can occur in up to 70% of pregnant women and typically has a benign course. [16] [17] It manifests as pain, numbness, and tingling in the thumb, index finger, middle finger and the thumb side of the ring finger. [18] The symptoms of carpal tunnel syndrome during pregnancy are usually mild and do ...
Immune tolerance in pregnancy or maternal immune tolerance is the immune tolerance shown towards the fetus and placenta during pregnancy. This tolerance counters the immune response that would normally result in the rejection of something foreign in the body, as can happen in cases of spontaneous abortion. [ 1][ 2] It is studied within the ...
An abdominal pregnancy is a rare type of ectopic pregnancy where the embryo or fetus is growing and developing outside the uterus, in the abdomen, and not in a fallopian tube (usual location), an ovary, or the broad ligament. [ 1][ 2][ 3] Because tubal, ovarian and broad ligament pregnancies are as difficult to diagnose and treat as abdominal ...
Stillbirth is defined as fetal death after 20 or 28 weeks of pregnancy, depending on the source. It results in a baby born without signs of life. Each year about 21,000 babies are stillborn in the U.S. [151] Sadness, anxiety, and guilt may occur after a miscarriage or a stillbirth. Emotional support may help with processing the loss. [152]