The PMHNP is evaluating an 11-year-old boy with intellectual disabilities, a long face, and large ears. He has midface hypoplasia, hyperextensible joints, and a short stature. She explains to the family that the child has which of the following?

Choice A reason: Williams syndrome is associated with distinctive facial features, cardiovascular anomalies, and strong verbal abilities, not consistent with the long face and large ears described. Choice B reason: Rett syndrome primarily affects females and includes regression of motor and communication skills, making it unlikely in this male patient. Choice C reason: Fragile X syndrome is characterized by intellectual disability, long face, large ears, joint hyperextensibility, and sometimes short stature, aligning with the patient’s presentation. Choice D reason: Turner syndrome affects females, involves short stature and certain facial features, but would not account for male presentation.