Spastic paraplegia four (SPG4; also referred to as SPAST-HSP) is characterized by insidiously progressive bilateral lessen-limb gait spasticity. Much more than 50% of influenced people have some weak point in the legs and impaired vibration sense for the ankles.???? ??? ? ?? ??: ??? ??? ???? ???? ??? ? ????.A variant of ependymoma, generally locate