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Teratoma of Septum Pellucidum in an Adult: Case Report and Review of Literature

Intracranial teratomas are rare developmental tumors, and those occurring in the septum pellucidum are distinctly rare. All the tumors reported so far have been in children. We report a case of mature teratoma of the septum pellucidum in a 50-year-old man. Presentation was nonspecific and the tumor seemed to be a mixed intensity lesion on magnetic resonance imaging. The tumor was excised by a minimally invasive keyhole interhemispheric transcallosal approach, and histopathology showed it to be a mature teratoma. Extragonadal teratomas are known for their predilection for midline. Involvement of ventricles is rare. The malignant variants grow aggressively, whereas the mature types can be excised with good prognosis.