Définition CISMeF : Infantile-onset ascending hereditary spastic paralysis (IAHSP) is a very rare motor
neuron disease characterized by severe spasticity of the lower limbs in early life,
progression of spasticity to the upper limbs in late childhood, and dysarthria.;
Infantile-onset ascending hereditary spastic paralysis (IAHSP) is a very rare motor
neuron disease characterized by severe spasticity of the lower limbs in early life,
progression of spasticity to the upper limbs in late childhood, and dysarthria.