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The author treated 20 cases of piriformis syndrome by needling Zhibian(BL 54) from June 2002 to August 2004. They were all outpatients in the department of acupuncture and moxibustion.Of them, 13 were males and 7 females; the ages ranged from 30 to 45 years; the shortest duration of disease was 10 days and the longest six months.