1st Trimester US (10-14 Weeks) Flashcards Preview

MFM Fellowship > 1st Trimester US (10-14 Weeks) > Flashcards

Flashcards in 1st Trimester US (10-14 Weeks) Deck (25)
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1

What do you look for in the Extremities?

Four limbs (each with three segments), Hands and feed in normal orientation

2

What do you look for in the placenta?

Normal size, texture, 3 vessel cord

3

What do you look for in the head (not face)?

Presence of head, Cranial Bones, Midline Falx, Choroid Plexus Filled Ventricles.

4

Diagnosis?

Omphalocele (Exomphalos) because you see the membrane, (Remember physiologic herniation resolved by 11-12 weeks)

5

What do you look for in the spine?

Intact overlying skin line, Vertebrae

6

Diagnosis?

Encephalocele

7

Things you never detect?

-ACC, Cerebellar hypoplasia -Duplex Kidneys, Hydronephrosis, Renal Agenesis -CCAM, Extralobar Sequestration -Duodenal Atresia, Bowel Obstruction

8

How do you date twins with size discrepancy?

Go by the bigger twin

9

Diagnosis?

Gastroschisis

10

Diagnosis?

Micrognathia

11

Diagnosis?

Lethal Skeletal Dysplasia (Frontal Bossing, chest:abdomen small)

12

What do you look for in the Abdomen?

Stomach in the LUQ, Bladder, Kidneys

13

What do you look for in abdominal wall?

Normal cord insertion, no umbilical defects

14

What do you look for in the heart?

Regular Cardiac Activity, Four symmetrical chambers

15

Things you should always detect?

Acrania, Anencephaly, Ectopia Cordis, and Encepalocele

16

Diagnosis?

Megacystis

17

Diagnosis?

Alobar Holoprosencephaly

18

What do you look for inside the chest (except heart)?

Symmetrical lung fields, No effusions or masses

19

What do you look for in the neck?

Nuchal translucency

20

Diagnosis?

Sacrococcygeal Teratoma (Why?, it's in front of the spine, and Intracranial translucency makes spina bifida less likely)

21

Megacystis, critieria? Likely diagnoses based on size?

>7mm criteria for Megacystis.

7mm-16mm think Chromosomal

>16mm think Lower Urinary Tract Obstruction

22

Diagnosis?

Acrania / Exencephaly / Anencephaly Sequence

23

What do you look for in the face?

Eyes (w/ Lens), Nasal bone, profile/mandible, Lips Intact.

24

Criteria for measurement of a CRL?

1) Midline Sagittal section of whole embryo/fetus

2) As horizontal as possible

3) Fills most of the width of the screen

4) Neutral position (not flexed or extended)

5) Clear endpoints to crown and rump

6) Amniotic fluid visible between chin and chest

25