A 5-year-old girl is somewhat short and has mild leg bowing. Her medical history is significant only for a well-controlled seizure disorder. Serum calcium, phosphorus, alkaline phosphatase levels, and urinary amino acid concentration are normal. A bone age is notable for abnormal distal radius and ulna mineralization.

What is the most likely diagnosis? *This case is from the Editorial team of Docplexus and is meant for educative purposes only. The correct answer will be posted soon!