A 4-year-old boy is brought to the physician after his mother noticed he started developing pubic hair. He had a recent growth spurt and is now taller than his 5-year-old brother, and his teacher has noticed axillary odor. On examination, his height is at the 96th percentile. There is sparse growth of long, pigmented hair at the base of the penis and in both axillae. Laboratory assessment reveals high serum concentrations of 17-hydroxyprogesterone and testosterone. Which of the following is most likely present in this patient?
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