A 4-year-old child has mental retardation, shortness of stature, brachydactyly (especially of the fourth and fifth digits), and obesity with round facies and short neck. The child is followed by an ophthalmologist for subcapsular cataracts, and has previously been noted to have cutaneous, subcutaneous, and perivascular calcifications of the basal ganglia. This patient is likely to have which of the following features?
a. Hypercalcemia
b. Hypophosphatemia
c. Elevated concentrations of parathyroid hormone
d. Advanced height age
e. Decreased bone density, particularly in the skull
a. Hypercalcemia
b. Hypophosphatemia
c. Elevated concentrations of parathyroid hormone
d. Advanced height age
e. Decreased bone density, particularly in the skull