一、前言先天性甲低症通称克汀病,据说发病率占出生数的3000—9000分之一,是智能障碍的极重要原因。笔者于1973—1977年5年间在日本全国调查就诊的497名克汀病中,约有2/3的患者有智能障碍。克汀病在新生儿—乳幼 I. Introduction Congenital hypothyroidism known as cretinism, the incidence is said to account for the birth number of 3000-9000, is a very important reason for mental retardation. About 49% of the cretinism patients surveyed in Japan in the five years between 1973 and 1977 showed that about two-thirds of them had mental retardation. Cretinism in the newborn - milk young