Ch. 48 Key Terms

Question 1

partial or complete absence of the cranium

Answer 1

acrania

Question 2

gestational sac without an embryo

Answer 2

anembryonic pregnancy (blighted ovum)

Question 3

congenital absence of the brain and cranial vault with the cerebral hemispheres missing or reduced to small masses

Answer 3

anencephaly

Question 4

during the first trimester, the bowel normally herniates outside the abdominal cavity between 8 and 12 weeks

Answer 4

bowel herniation

Question 5

protrusion of the brain from the cranial cavity

Answer 5

cephalocele

Question 6

complete expulsion of all products of conception, including embryo and deciduas

Answer 6

complete abortion

Question 7

a physiologic cyst that develops within the ovary after ovulation, secretes progesterone, and prevents menses if fertilization occurs; may persist until the 16th to 18th week of pregnancy

Answer 7

corpus luteum cyst

Question 8

fluid-filled structure (often with septations) initially surrounding the neck; may extend upward to the head or laterally to the body

Answer 8

cystic hygroma

Question 9

a pregnancy that implants in a location other than the center of the uterus

Answer 9

ectopic pregnancy

Question 10

congenital defective opening 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

Answer 10

gastroschisis

Question 11

condition in which trophoblastic tissue overtakes the pregnancy and propagates throughout the uterine cavity; partial and complete

Answer 11

gestational trophoblastic disease

Question 12

simultaneous intrauterine and extrauterine pregnancy

Answer 12

heterotopic pregnancy

Question 13

failure of forebrain to divide into two cerebral hemispheres, resulting in a single large ventricle with varying amounts of cerebral cortex; has been known to occur with trisomies 13, 15, and 18

Answer 13

holoprosencephaly

Question 14

pregnancy loss with products of conception remaining in the uterus

Answer 14

incomplete spontaneous abortion

Question 15

a rare neural tube defect in which the brain tissue protrudes through a fissure in the occiput, so that the brain and the spinal cord occupy a single cavity

Answer 15

iniencephaly

Question 16

pregnancy occurring in the fallopian tube near the cornu of the uterus; also known as cornual pregnancy

Answer 16

interstitial pregnancy

Question 17

congenital defect of the abdominal wall with protrusion of abdominal contents into the base of the umbilical cord; the cord appears to enter the mass

Answer 17

omphalocele

Question 18

decidual reaction with fluid occurring within the uterus in a patient with an ectopic pregnancy

Answer 18

pseudogestational sac

Question 19

additional term for missed abortion or miscarriage

Answer 19

spontaneous pregnancy loss (SPL)

Question 20

a nonlethal genetic abnormality; chromosomal makeup is 45XO instead of the normal 46XX or 46XY. Cystic hygroma often is seen in affected fetuses in the first trimester. Survivors tend to be short in stature with low-set ears, webbing of the neck, a shield-shaped chest, and infertility as a result of an endocrine disorder caused by failure of the ovaries to respond to pituitary hormone

Answer 20

Turner’s syndrome

Question 21

dilation of the cerebral ventricles without enlargement of the cranium

Answer 21

ventriculomegaly