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Infantile-onset ascending hereditary spastic paralysis

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

Pronunciation
/ˈɪnfəntɪl - ˈɔnˌsɛt əˈsɛndɪŋ həˈrɛdəˌtɛri ˈspæstɪk pəˈræləsəs/
/ˈɪnfəntʌɪl - ˈɒnsɛt əˈsɛndɪŋ hɪˈrɛdɪtəri ˈspastɪk pəˈralɪsɪs/