RESUMEN
Turner syndrome (TS) patients with Y chromosome material face an increased risk of gonadal germ cell tumors (GCTs). This case report discusses the challenges in decision-making regarding prophylactic gonadectomy, considering the risk of malignancy and the desire to preserve fertility. We report a case of a 12-year-old female with mosaic TS and Y chromosome material who initially presented with short stature and obesity. Karyotype analysis showed a mixed cell line (45X and 46XY). Counseling about the increased risk of developing GCT and preservation of gonadal function was provided, and we decided to delay gonadectomy until the age of 12. Prophylactic bilateral gonadectomy revealed dysgerminoma associated with GB at the age of 12. Fortunately, the patient was asymptomatic, with no additional therapy required due to the early stage of the disease. The case highlights the dilemma in managing TS patients with Y chromosome material, where the risk of GCT varies depending on the type of difference in sex development and gonadal function. The decision to delay gonadectomy reflects the emphasis on preservation of ovarian, although it poses a risk of malignancy. This case underscores the importance of individualized care in TS patients with Y chromosome material, balancing the risk of malignancy against preservation of ovarian. It emphasizes the need for timely and personalized decision-making in prophylactic gonadectomy.