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CASE 16



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History: A patient has a routine ultrasound scan in the second trimester that shows a nuchal thickness of 7 mm at 20 weeks.



1. What should be included in the differential diagnosis of nuchal thickness of 7 mm at a gestational age of 20 weeks? (Choose all that apply.)


A. Trisomy 21


B. 45X (Turner syndrome)


C. Triploidy karyotype


D. Trisomy 13


E. Trisomy 18


2. The most correct diagnosis for nuchal thickness in the second trimester would include a plane through all of the following except:


A. Cavum septi pellucidi


B. Cerebellar hemisphere


C. Body of the lateral ventricle


D. Cerebral peduncles


3. Which of the following statements concerning the measurement of nuchal thickness is false?


A. Nuchal thickening is a sensitive nonstructural abnormality associated with trisomy 21.


B. Redundant skin at the back of the neck associated with trisomy 21 was first reported by Benacerraf.


C. A threshold of 6 mm or more is the measurement that has been reported for increased risk of trisomy 21.


D. Cut-off of 5 mm or more of nuchal thickness may be a better threshold measurement for detection of Down syndrome.


4. Which of the following is not a subtle marker in Down syndrome (trisomy 21)?

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Jan 10, 2016 | Posted by in OBSTETRICS & GYNAECOLOGY IMAGING | Comments Off on 16

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