Fetal Abdominal Anatomy

I'm Open!

100

Herniation of the small bowel in a midline sac measuring less than 7 mm seen in early gestation

Physiologic herniation

200

Midline abdominal wall defect with viscera covered by a membrane. 

Omphalocele

300

Paraumbilical defect typically to the right of the umbilical cord insertion with evisceration of bowel

Gastroschisis

400

Complex large anterior wall defect with fetus fixed to placenta  with deformities of the spine and limbs.

Body Stalk Anomaly

500

Defect in the abdominal wall below the attachment of the umbilical cord

Bladder Exstrophy

Fluidity

100

Fluid filled structure in the left fetal abdomen not crossing the midline.

Stomach

200

Accumulation of excess fluid in the fetal abdomen

Ascites

300

Fluid filled structure in fetal abdomen that is typically not seen filled with fluid until the third trimester 

Bowel

400

Pear shaped fluid filled structure in the right fetal abdomen

Gallbladder

500

Double Bubble in the left fetal abdomen

Duodenal atresia

Let's Get Technical

100

Elliptical measurement taken at the level of the stomach and umbilical vein in transverse view

Abdominal Circumference 

200

structure visualized immediately anterior to the vertebral bodies in AC view

Aorta

300

J shaped structure seen in the AC transverse view 

Umbilical vein

400

Thin arched hypoechoic band seen in sagittal and coronal view of fetal abdomen and chest 

Diaphragm

500

Localized bulging of the fetal intraabdominal umbilical vein with  diameter ≥ 9 mm 

Umbilical Vein Variz

In the Beginning

100

2 tissues that arise from the Trophoblast 

Cytotrophoblast and Syncytiotrophoblast

200

Blastocyst cavity remolded this number of times

2- Primary and secondary yolk sac

300

Germ layer giving rise to the GI tract 

Endoderm

400

2 areas of the gut in which the ectoderm and endoderm are not separated by the mesoderm 

oropharyngeal membrane and cloacal membrane

500

Outpouching formed when the yolk sac fails to regress completely 

Mekel diverticulum 

Extraordinary or NOT

100

Bright areas in the fetal lower abdomen appearing as bright as bone 

Echogenic Bowel 

200

Echogenic material seen in fluid filled structure below the fetal liver

Gallstones

300

Abdominal wall defect that is high in the abdomen and associated with defect in diaphragm, distal sternal defect, pericardial defect and cardiac abnormalities 

Pentalogy of Cantrell

400

Most common primary malignancy  in fetal liver 

Hepatoblastoma

500

Duplication of the gastrointestinal tract with enteric lining and muscular wall

Enteric Duplication cyst