Reinke crystalloids can be seen in which of the following sex cord-stromal tumours?: (A) Leydig cell tumour, (B) Granulosa cell tumour, (C) Gonadoblastoma, (D) Thecoma
Answer is A. Hilus cell tumours (pure Leydig cell tumours) are rare, unilateral tumors comprised of large lipid-laden Leydig cells with distinct borders and characteristic cytoplasmic structures called Reinke crystalloids.