RESUMO
Intracranial malignant tumors during pregnancy are rare. Primary meningeal sarcoma with leiomyoblastic differentiation during pregnancy has not been reported. We present the case of a 25-year-old woman in the third trimester of pregnancy with a large intracranial tumor destructing the parietal calvaria and invasion of soft tissues. Histological examination revealed primary meningeal sarcoma with leiomyoblastic differentiation. A gross macroscopical resection of the tumor with removal of the infiltrated parietal calvaria was performed after delivery of a healthy baby through caesarean section. A mass on the head rapidly enlarging during pregnancy should be considered for a malignancy of intracranial origin. Early radiological exams as well as tumor resection followed by staging and multimodality treatment should be urgently performed.