The case reports of two sisters admitted for evaluation of primary amenorrhea are presented. Gynecological and endocrinological investigations and chromosomal analysis led to the diagnosis of familial 46,XY gonadal dysgenesis. Both sisters underwent bilateral salpingo-oophorectomy and hysterectomy. Histological examination revealed dysgenetic gonads with gonadoblastoma and dysgerminoma. Five years after treatment by surgery and irradiation the patients are well and free of recurrence. These cases again confirm the risk of malignancy and the necessity of prophylactic gonadectomy in all patients with gonadal dysgenesis and Y chromosomal material.
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