Spastic paraplegia four (SPG4; often known as SPAST-HSP) is characterised by insidiously progressive bilateral reduce-limb gait spasticity. A lot more than fifty% of influenced persons have some weak spot from the legs and impaired vibration perception for the ankles.????? ??? ????? ???? ????.????? ???? ??? ??? ??? ???? ?????.A variant of ependymom