Department of Obstetrics and Gynecology, Serlin Maternity Hospital, Tel Aviv, Israel

Doctor Wolman is a member of the Obstetrics and Gynaecology Communications International Editorial Board.

The patient is a 24-year-old primigravida with an unremarkable medical history. The following ultrasound pictures were taken at 22 weeks' gestation when the patient presented for a routine ultrasound examination.

1. What is this condition called?
   
   
2. What are the ultrasonographic criteria for the diagnosis?
   
   
3. What is the incidence of this malformation?
   
   
4. What is a key prognostic consideration in such cases?
   
   

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