Library@ObG

Test Entry – US Atlas (Library@ObG)

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Key Points:

General Notes

  • Exercise caution with gender discordance between NIPS and ultrasound
    • NIPS is a screening test only
    • Invasive testing (amniocentesis or CVS) is considered diagnostic
  • Gender determination should be done using both mid-sagittal and axial views

Male

  • Sagittal view
    • Penis and scrotum should be seen below the cord insertion
  • Axial view
    • Inability to differentiate penis distinctly from scrotum on axial view should raise suspicion for hypospadias or ambiguous genitalia
Figure 48 (NOTE – Top row should be labelled ‘sagittal view’ ; Lower row should be labelled ‘axial view’)

Figure 48 (NOTE – Top row should be labelled ‘sagittal view’ ; Lower row should be labelled ‘axial view’)

  1. Penis
  2. Scrotum
  3. Leg

Female

  • Sagittal view
    • In 2nd trimester, the mons pubis/female genitalia should appear flat
  • Axial view
    • Three distinct lines should be seen on axial view representing the labia
Figure 49 (NOTE – Top row should be labelled ‘sagittal view’ ; Lower row should be labelled ‘axial view’)

Figure 49 (NOTE – Top row should be labelled ‘sagittal view’ ; Lower row should be labelled ‘axial view’)

  1. Bladder
  2. Mons pubis
  3. Umbilical cord
  4. Labia
  5. Thigh

Important to Note

  • If ever in doubt as to whether findings are ‘within normal’, refer for specialized (also known as targeted or detailed) ultrasound
  • ACOG/SMFM recommends offering invasive testing using microarray for fetal structural anomalies detected on prenatal ultrasound

Learn More – Primary Sources:

Callen’s Ultrasonography in Obstetrics and Gynecology, 6th edition, ISBN 9780323328340

Locate a Maternal Fetal Medicine Specialist:

Maternal-Fetal Medicine Specialist Locator-SMFM

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