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Stiff-person syndrome

rare neurologic disorder characterized by progressive rigidity and stiffness in truncal muscles, spasms, postural deformities, chronic pain, impaired mobility, and lumbar hyperlordosis

Pronunciation
/stɪf - ˈpəːsən ˈsɪndrəʊm/
/stɪf - ˈpərsən ˈsɪnˌdroʊm/