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Fetal brain tumors are rare. Teratoma is the most common histological type. Their evolution is often fatal. Ultrasound and magnetic resonance imaging allows for early antenatal diagnosis. However, definitive diagnosis is based on histologic examination. Placental metastases are rare and complicate more often the course of malignant melanomas, hemopathies, breast and bronchial cancers. In pregnant women who have recently had a cancer, anatomopathologic examination of the placenta should be requested to detect tumor invasion. Similarly, neonatal assessment and extended pediatric follow-up are required. The establishment of registries collecting all cancer cases diagnosed among pregnant woman is essential for a better understanding of the epidemiology of these cancers as well as of maternal and paediatric prognostic factors. We here report a case of fetal brain tumor in a woman with recurrent ovarian cancer., Competing Interests: Les auteurs ne déclarent aucun conflit d'intérêts., (© Houda Rhalem et al.)