[Cystic meningiomas]

The author gives an account of three cases of cystic meningioma in a group comprising 184 operated meningiomas (1.63%). He reviews views on the aetiology of the cystic peri- and intra-tumoural formation. Neuroradiological findings resembling glial and metastatic tumours with cystic or necrotic changes frequently lead to an incorrect preoperative diagnosis in this potentially curable lesion. For prevention of relapses of cystic meningioma it is essential to remove not only the solid tumourous node but the entire wall of the cyst, which may be difficult from the technical aspect.