Patient Case: A 30-year-old pregnant woman undergoes a second-trimester ultrasound. The ultrasound reveals intrauterine growth restriction, polyhydramnios, and a fetal heart defect. A detailed examination identifies overlapping fingers and rocker-bottom feet. Amniocentesis is performed, and the fetal karyotype confirms 47, XY +18. The parents are concerned about the long-term prognosis of the baby. Question: Which of the following is true regarding Edwards syndrome?
