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Review Question - QID 109839

Congenital Adrenal Hyperplasia (CAH) 17α-hydroxylase Deficiency Presentation QID: 109839 (M2.EC.17.4869)
In scope icon M 6 D
QID 109839 (Type "109839" in App Search)
A 14-year-old girl is referred to a gynecologist for amenorrhea. Her mother is also concerned that she hasn't grown any hair "in her private parts." The patient states that she is getting used to high school and wants to join the volleyball team but complains that her weakness and headaches limit her physical activity. She does not share her mother's concerns about her menses. Her parents are maternal cousins. Her temperature is 98°F (37°C), blood pressure is 160/90 mmHg, pulse is 70/min, and respirations are 24/min. Her cardiac exam is unremarkable, and her abdominal exam reveals no bruits. Exam reveals a normal-appearing vagina without any hair. No cervical os can be palpated. Initial labs reveal the following:

Serum:
Na+: 143 mEq/L
Cl-: 110 mEq/L
K+: 2.9 mEq/L
HCO3-: 26 mEq/L
BUN: 40 mg/dL
Glucose: 104 mg/dL
Creatinine: 1.3 mg/dL

Which of the following is the most likely diagnosis?
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