How is the lemon sign assessed in prenatal testing?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

Prepare for your Neural Tube Defects Myelomeningocele/Spina Bifida test with detailed flashcards and multiple-choice questions. Each query is supplemented with hints and explanations. Ace your exam with confidence!

Multiple Choice

How is the lemon sign assessed in prenatal testing?

Explanation:
The lemon sign is identified on fetal ultrasound as a lemon-shaped contour of the skull caused by flattening of the frontal bones seen in axial views. This view is most reliably obtained during routine prenatal ultrasound screening in the second trimester, typically before 24 weeks gestation. Ultrasound is the preferred method because it is noninvasive, safe for the fetus, and readily available for assessing skull shape and brain structures. MRI can provide more detail if needed after ultrasound, but it is not the primary tool for this sign. X-ray and CT involve radiation and are not used for prenatal evaluation.

The lemon sign is identified on fetal ultrasound as a lemon-shaped contour of the skull caused by flattening of the frontal bones seen in axial views. This view is most reliably obtained during routine prenatal ultrasound screening in the second trimester, typically before 24 weeks gestation. Ultrasound is the preferred method because it is noninvasive, safe for the fetus, and readily available for assessing skull shape and brain structures. MRI can provide more detail if needed after ultrasound, but it is not the primary tool for this sign. X-ray and CT involve radiation and are not used for prenatal evaluation.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy