患儿男，6岁。因发现阴毛2个月就诊。査体:身髙+2SD，无喉结。尚未变声，阴毛P3期，阴茎明显较同龄儿大，长6cm,周径5cm,双睾丸体积各3ml，皮肤无牛奶咖啡斑，但色稍深，骨龄10岁，头颅MRI检查为正常。此患儿最可能的诊断是

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