Ependymal cyst (EPENDYMAL CYST) is a rare neurological disease characterized by a pathological formation with a characteristic histological and architectural structure, usually formed from ependyma. The disease refers to progressive forms of oncological processes of the nervous system. Depending on the nature of origin, angioependymoma, adenoependymoma and meningioependymoma cyst are distinguished. A.G. Kryukov proposed to combine brain ependymomas into one type - mucoependymoma.