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Chronic subdural hematoma can be seen frequently in the cerebral convexity, however, it is rare in the interhemispheric space. It develops usually in patients with blood clotting disturbance, history of head trauma, chronic alcoholic abuse. When its volume becomes large, falx syndrome showing hemiparesis which is more prominent in the leg than in the arm or an isolated paresis of one leg, can be noticed. The interhemispheric chronic subdural hematoma can be managed by the conservativel treatment or surgical evacuation of hematoma. Decision on the treatment modality depends on the clinical course. Conservative management is the treatment of choice for patients without disturbances of consciousness and other neurological deficits. However, early surgical treatment is necessary in patients with progressive neurological deterioration. The authors report a case of chronic subdural hematoma in interhemispheric space which was managed by medical treatment. Key words:Interhemisphere;Subdural hematoma;Falx syndrome.