Ovarian vein sampling, and serum and urine testosterone monitoring in ovarian Leydig cell tumors: A report of two cases

•Pure Leydig cell tumors of the ovary are rare tumors diagnosed in two women with hyperandrogenism.•Ovarian vein sampling identified a right ovarian testosterone-producing tumor not seen on imaging.•Testosterone levels decreased 53% in one patient and 80% in the other within 3 hours of Leydig cell tumor removal.