1　病例简介患儿女,2周岁。患儿15～2岁间有两次不规则月经,持续2～3ｄ,间隔15个月。乳房稍有突起,临床以性早熟介绍作脑电检查。脑电图示:大脑两半球以8～85ｃ/ｓα活动及节律为主,波幅40～200μｖ,α活动分布以顶枕区为主,α活动不规则,α指数可达80%。α活动中混有较多量6～ 1 case description children, 2 years old. Children aged 15 to 2 years have irregular menstruation twice, lasting 2 ~ 3d, 15 months apart. A slight protrusion of the breast, clinical precocious introduction for EEG examination. Electroencephalogram: The two hemispheres of cerebellum were mainly composed of 8 ~ 85c / sα activity and rhythm, the amplitude was 40 ~ 200μv. The distribution of α activity was mainly in the parietal occipital region. The α activity was irregular and the α index was up to 80%. α activity mixed with a larger amount of 6 ~