CASE 24
Arrows = associated fused thalami; L = left; R = right.
History: A patient presents with an ultrasound scan that was obtained at an outside institution and that shows a cystic brain mass.
1. What should be included in the differential diagnosis? (Choose all that apply.)
B. Semilobar holoprosencephaly
2. Which of the following is not a common facial finding in a fetus with alobar holoprosencephaly?
A. Cyclopia
B. Ethmocephaly
C. Cebocephaly
3. What is the most common chromosomal abnormality associated with alobar holoprosencephaly?
A. Trisomy 13
B. Trisomy 18
C. Trisomy 21
4. Survival of infants with alobar holoprosencephaly is closest to what percentage?
A. 10%
B. 30%
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