Term
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Definition
| partial or complete absence of the cranium |
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Term
anembryonic pregnancy
(blighted ovum) |
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Definition
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Term
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Definition
| congenital absence of the brain and cranial vault with the cerebral hemispheres missing or reduced to small masses |
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Term
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Definition
| during the first trimester the bowel normally herniates outside the abdominal cavity between 8 and 12 weeks |
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Term
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Definition
| protrusion of the brain from the cranial cavity |
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Term
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Definition
| complete removal of all products of conception, including placenta |
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Term
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Definition
| a physiologic cyst that develops within the ovary after ovulation and secretes progesterone and prevents menses if fertilization occurs; may persist until the 16th to 18th week of pregnancy |
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Term
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Definition
| fluid-filled structure (often with septations), initially surrounding the neck, may extend upward to the head or laterally to the body |
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Term
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Definition
| pregnancy outside the uterus |
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Term
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Definition
| congenital fissure that remains open in the wall of the abdomen just to the right of the umbilical cord; bowel and other organs may protrude outside the abdomen from this opening |
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Term
| gestational trophoblastic disease |
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Definition
| condition in which trophoblastic tissue overtakes the pregnancy and propagates throught the uterine cavity |
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Term
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Definition
| simultaneous intrauterine and extrauterine pregnancy |
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Term
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Definition
| failure of forebrain to divide into cerebral hemispheres, which results in a single large ventricle with varying amounts of cerebral cortex that has been known to occur with trisomies 13 to 15 and trisomy 18 |
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Term
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Definition
| retained products of conception |
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Term
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Definition
| a congenitally deformed fetus in which the brain substance protrudes through a fissure in the occiput, so that the brain and spinal cord occupy a single cavity |
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Term
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Definition
| pregnancy occuring in the fallopian tube near the cornu of the uterus; also known as cornual pregnancy |
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Term
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Definition
| congenital hernia of the umbilicus that is covered with a membrance; the cord may be seen in the middle of the mass |
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Term
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Definition
| decidual reaciton that occurs within the uterus in a patient with an ectopic pregnancy |
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Term
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Definition
| a nonlethal genetic abnormality in which chromosomal makeup is 45 XO insteade of the normal 46 XX or XY. Cystic hygroma often is seen in affected fetuses in the first trimester. Survivors tend to be short in stature with low-set ears, have webbing of the nech, shield-shaped chest, and infertility as a result of an endocrine disorder caused by failure of the ovaries to respond to pituitary hormone |
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Term
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Definition
| dilation of the ventricular system without enlargement of the cranium |
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Term
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Definition
| When can the embryonic head sonographically be identified? |
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Term
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Definition
| The dominant structure seen within the embryonic cranium in the first trimester, which fills the lateral ventricles that in turn fill the cranial vault, is what? |
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Term
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Definition
| brain necrosis from occlusion of the internal carotid arteries |
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Term
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Definition
| when is traditional cranial anatomy visualized? |
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Term
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Definition
| What is thought to be the predecessor of anencephaly? |
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Term
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Definition
| When does the ossification of the cranium begin? |
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