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TO THE EDITOR. —The possible causes of ataxic hemiparesis have recently been discussed by Ichikawa et al (Archives 1982;39:585-586). We report one more case in which the apparent cause of the syndrome was an infarction in the posterior corona radiata of the contralateral cerebral hemisphere. REPORT OF A CASE. —A 41-year-old male business executive had been diabetic for ten years and was receiving insulin therapy but had otherwise been in excellent health. On Sept 6, 1982, two days before admission to our hospital, he noticed clumsiness and weakness in his right extremities. On admission, a slight right hemiparesis was noticed on the right. Moderate right-sided ataxia was also demonstrated in the finger-to-nose and heel-to-knee tests. The paretic extremities were clumsy, and the patient had difficulty performing rapid reciprocal movements. Slight depression was also noted in various sensory modalities on the paretic side, the most marked defect being in the sense