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Eval. the Placenta 2-3 Tri.
OB/GYN Sonography
36
Medical
Undergraduate 4
02/19/2009

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Cards

Term
What does placenta mean in Greek?
Definition
flat cake
Term
When does the placenta become fully functional?
Definition
15 weeks
Term
Endocrine functioning units of the placenta.
Definition
chorionic villi
Term
Four functions of the placenta.
Definition
1. nutrition 2. pulmonary 3. renal (waste removal) 4. produces hormones
Term
What hormones does the placenta produce?
Definition
hcg, progesterone and estrogen
Term
Where does nutrient and blood exchange occur in the placenta?
Definition
lacunae, clefts, or intervillous spaces
Term
Placental size is directly proportional to:
Definition
fetal size
Term
Placental function is directly related to:
Definition
fetal health
Term
When the AP thickness of the placenta is greater than 5 cm.
Definition
placentalmegaly
Term
Hypoechoic areas of the placenta lacking flow could be:
Definition
fibrin deposits and/or thrombosis
Term
Ischemic necrosis of placental villi resulting from interference with maternal blood flow to the intervillous space.
Definition
placental infarct
Term
What grade placenta shows suttle indentations?
Definition
grade 1
Term
What grade placenta shows comma like indentations?
Definition
grade 2
Term
What grade placenta shows comma like indentations projecting to the basalar plate?
Definition
grade 3
Term
What abnormal intraplacental lesion has increased hcg, but no embryo?
Definition
hydatidiform mole
Term
What abnormal intraplacental lesion has a non-viable embryo?
Definition
partial mole
Term
A blood vessel tumor appearing as a hypoechoic, well-circumscribed mass beneath the chorion?
Definition
chorioangioma
Term
Is a teratoma in the placenta benign or malignant?
Definition
malignant
Term
What kind of placenta may be associated with vaginal bleeding and may require a c-section delivery?
Definition
previa
Term
What three factors are associated with placenta previa?
Definition
1. AMA 2. multiparity 3. prior c-section/surgery
Term
What type of previa has a vessel overlying the os?
Definition
vaso previa
Term
What is the most common cause of painless 2nd and 3rd trimester bleeding?
Definition
placenta previa
Term
Chorionic plate is smaller than basalar plate resulting in a shelf or folding appearance of the placenta.
Definition
circumvallate placenta
Term
Extra lobes of the placenta with vessels.
Definition
succenturiate placenta (accessory)
Term
Placenta divided into two lobes but united by primary vessels and membranes.
Definition
Bipartite/Lobate
Term
Ring shaped placenta attaches like a belt to the myometrium.
Definition
annular
Term
Placenta covers all or most of the sac.
Definition
placenta membranacea
Term
Accumulation of blood beneath the chorionic plate.
Definition
subchorionic hematoma
Term
When is a subchorionic hematoma most commonly seen?
Definition
1st trimester
Term
Premature detachment of all or part of the placenta from the uterine wall before delivery of the fetus.
Definition
placental abruption
Term
What are the two types of placenta abruptions?
Definition
concealed and external
Term
Chorionic villi invades the myometrium.
Definition
placenta accreta
Term
What are the types of accretas, from mild to severe?
Definition
accreta, increta, percreta
Term
Insertion of the cord along the margin of the placenta.
Definition
marginal/battledore
Term
Insertion along the free membranes of the placenta.
Definition
velamentous
Term
Velamentous cord insertion is associated with what?
Definition
vaso previa and succenturiate lobe
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