Sertoli-Leydig cell tumour in a patient with non-classic congenital adrenal hyperplasia: an uncommon duo.

Polycystic ovary syndrome is the most common cause of hyperandrogenism in young females. Other causes are congenital adrenal hyperplasia (CAH), androgen-producing tumours and drugs. The severity and tempo of virilisation help in distinguishing the tumoural from non-tumoural causes.