Multiple Choice
A 2-year-old girl is being evaluated for bilateral leg pain and muscle weakness with associated growth delay. She is able to sit but unable to stand or walk without support due to pain. Physical examination shows patchy alopecia, frontal bossing, wrist widening, and lateral bowing of the tibia and fibula. Skeletal imaging reveals generalized osteopenia with cupping and fraying at the metaphyseal ends of the long bones of the upper and lower extremities. Further evaluation reveals a homozygous inactivating mutation in the gene encoding the vitamin D receptor. A serum sample would most likely show which of the following findings?
A) A
B) B
C) C
D) D
E) E
Correct Answer:
Verified
Correct Answer:
Verified
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