Nelson Textbook of Pediatrics 22nd Edition | Undervirilized male. Causes: androgen synthesis defects (5α-reductase type 2, 17β-HSD), androgen action defects (complete/partial androgen insensitivity, CAIS/PAIS), gonadal dysgenesis (Swyer, mixed), Leydig cell hypoplasia. Diagnosis: hCG stimulation test, testosterone/DHT ratio, AMH, genetic testing.
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