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Introduction: Glioma is seldom diagnosed during pregnancy. In this situation management presents difficult problems for both neuro-oncologists and obstetricians. We report four cases and discuss the management of this unusual situation., Case Report: The first patient was admitted to hospital at 29 weeks' gestation because of a generalized seizure and a right hemiparesis. MRI showed a left fronto-insular lesion. A stereotactic biopsy was obtained and revealed an anaplastic oligodendroglioma. With corticosteroids the patient remained stable until cesarean delivery at 36 weeks. In post-partum additional treatment with chemotherapy was started. The second patient was hospitalized at 26 weeks' gestation because of cranial hypertension, right hemiparesis and aphasia. MRI showed an important left fronto-parietal lesion. Partial resection was performed at 28 weeks. Histology revealed a glioblastoma multiforme. With corticosteroids the patient remained stable until cesarean delivery at 33 weeks. In post-partum additional treatment with radiotherapy and chemotherapy was started. The third patient was admitted to the hospital at 12 weeks' gestation because of cranial hypertension. MRI showed a left frontal lesion. A subtotal resection was done at 13 weeks. Histology revealed a glioblastoma multiforme. Two weeks after surgery the patient's neurological condition worsened and in agreement with the patient a therapeutic abortion was decided. Afterwards additional treatment with radiotherapy and chemotherapy was started. The last patient received combined treatment with radiotherapy and chemotherapy for local recurrence of a mesencephalic high-grade glioma. A posteriori it was discovered that the patient was at 4 months' gestation during this treatment. Cesarean delivery was done at 36 weeks. The child was normal at birth and is still in good health 5 years later., Conclusion: The management of gliomas diagnosed during pregnancy should not be different from the standard management of gliomas in young non-pregnant adults. Pregnant women because of their young age can have a long survival. Their pregnancy should not prevent them from receiving the best treatment for their glioma. Treatment will depend upon clinico-radiological presentation, histology, gestational age and the patient's desires. Generally speaking, surgical resection of high-grade gliomas should not be delayed during pregnancy. Progress in anesthesia and neurosurgery have greatly reduced the risks for the foetus. After delivery, if the delay between surgery and delivery is too long it is possible to begin cerebral radiotherapy during pregnancy. After the first trimester of gestation this treatment can be given without any important risks for the child.