第八章第二节21-三体综合症21-三体综合征 了解本病的细胞遗传学与遗传学咨询了解本病的细胞遗传学与遗传学咨询 (To understand(To understand cytogeneticscytogenetics and genetic and genetic counsellingcounselling)掌握本病的临床特征及诊断掌握本病的临床特征及诊断 (To master symptoms,signs and diagnosis)(To master symptoms,signs and diagnosis)了解本病的鉴别诊断了解本病的鉴别诊断 (To understand differential diagnosis)(To understand differential diagnosis)21-三体综合征我国每年大约有我国每年大约有26,60026,600个唐氏综合征患儿出生，平均个唐氏综合征患儿出生，平均每每2020分钟就有分钟就有1 1例出生例出生，估计我国现有病人，估计我国现有病人6060万以上万以上(26,600 town syndromes occur in
