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先天性甲状腺功能低下症（甲低）是最常见的导致先天性痴呆的原因之一。这种痴呆是可以预防的。苯丙酮尿症（ＰＫＵ）也是一种以智能发育不全为主要特征的遗传性代谢性疾病，是少数几种可以早期诊断、治疗、可以预防其智能障碍出现的疾病之一。ＰＫＵ只要得到及早治疗都会取得
Congenital hypothyroidism (hypothyroidism) is one of the most common causes of congenital dementia. This dementia is preventable. Phenylketonuria (PKU) is also a hereditary metabolic disease characterized by mental underdevelopment and is one of the few diseases that can be diagnosed and treated early to prevent its mental retardation. As long as PKU get early treatment will be made