The case presented was a 10-year-old girl, native of Taiwan, who had over two years history of progressive dystonic movements starting from the right leg and gradually spreading over almost all striated muscles except the facial ones. During her 40 day hospitalization she either lay on bed or sat on chair most of the times, assuming a posture of spastic torticollis, twisted trunk, f1exed legs and inverted feet. Whenever she attempted to rise on her feet, she had to sway her loin girdle with bended hip and knee joints, looking like an ostrich No apparent cause can be attributed to the dystonic movements. The dystonic movements completey disappeared while she was asleep. Neurological examination performed while the patient was asleep, revealed no abnormality. Mentality and speech were normal in this case as they usually were in the early stages of the idiopathic type of the disease appearing in the literature. As quinine treatment for one week was of no effect on this patient, mephenoxalone was tried next with an initial dose of 800mg and maintenance dose of 1600mg per day. Some improvement, though not to a satisfactory degree, of the involuntary movements was observed during the mephenoxalone treatment. The literature was reviewed. Since 1941 five cases of torsion spasm have been reported in Taiwan: one of the cases was described as familial idiopathic torsion dystonia, the others were secondary either to febrile, convuslive disorders or to abnormality accompanying delivery.