Marfan syndrome is characterized by tall stature with disproportionately long extremities, arachnodactyly, ectopia lentis, and aortic root dilation. None of these features were described in the vignette.

Turner syndrome is characterized by short stature, webbed neck, low-set ears, and lymphedema of the hands and feet. These features are not seen in the vignette.

Edward's syndrome, or trisomy 18, is characterized by severe intellectual disability, micrognathia, overlapping fingers, rocker-bottom feet, and congenital heart disease. These features are not seen in the vignette.

Down syndrome, or trisomy 21, typically shows up with intellectual disability, flat facial profile, oblique palpebral fissures, and single palmar crease. These features are not seen in the vignette.