YAP1 and posterior fossa ependymoma: Current WHO classification for ependymal includes supratentorial ependymoma (ZFTA fusion-positive), supratentorial ependymoma (YAP1 fusion-positive), posterior fossa ependymoma (group PFA), posterior fossa ependymoma (group PFB), spinal ependymoma (MYCN-amplified), myxopapillary ependymoma, and subependymoma [7].