Reverse seeding of recurrent intraspinal malignant meningioma.

Meningiomas are common intracranial and intraspinal tumors and constitute 15-20% of all primary brain tumors. Ten to 15% of all meningiomas are considered malignant. The main treatment of meningiomas is surgical resection. Meningioma recurrence following surgery is frequent. However, it is not clear whether recurrent meningiomas, close or distant to the primary resection site, arise from incomplete resection, dissemination of tumor fragments or from independent tumor growth. We herein describe a 40-year-old woman with intraspinal malignant meningioma recurring each time upwards, i.e. apparently by reverse way of seeding, via cerebrospinal fluid.