先天愚型(Down syndrome)又称21三体综合征,是常见的一种染色体病,但易位型先天愚型较少见。现将所遇一例报告如下:患者,女性,1(6/12)岁,第一胎足月顺产。智能发育较一般婴儿缓慢。查体身高64cm,体重9.5kg。头颅稍小而圆,枕部扁平,脸呈圆形,眼裂小且外眦上斜,眼间距宽,鼻梁低平,鼻腔及口腔均小,舌偶外伸。耳小,两耳位不 Down syndrome, also known as trisomy 21, is a common chromosomal disorder, but the translocation of Down’s syndrome is less common. The following is a case report: Patients, women, 1 (6/12) years old, full-term first-term birth. Intelligent development is slower than normal infants. Physical examination height 64cm, weight 9.5kg. Skull slightly smaller and round, occipital flat, round face, small ocular cleavage and lemmas oblique, wide ocular distance, nose and flat, nasal and oral are small, tongue outreach. Small ears, ears are not