Spastic paraplegia four (SPG4; also called SPAST-HSP) is characterized by insidiously progressive bilateral lower-limb gait spasticity. Much more than 50% of influenced individuals have some weak point during the legs and impaired vibration sense for the ankles.???? ??? ? ?? ??: ??? ??? ???? ???? ??? ? ????.A variant of ependymoma, often found in t