我们于1985年1月至1986年12月共作外周血淋巴细胞培养染色体G带检查250例,其中发现2例第5号染色体为环状染色体,而幼儿表现为小头畸形。报告如下。例1,男性,3岁,顺产,出生体重1.9kg。双亲非近亲结婚。就诊时表现为发育迟缓,先天愚型脸,小头畸形,右耳流脓,无睾丸,四肢肌张力低。染色 We from January 1985 to December 1986 a total of peripheral blood lymphocyte culture chromosome G band examination of 250 cases, of which found in 2 cases of chromosome 5 circular chromosomes, and young children showed microcephaly. The report is as follows. Example 1, male, 3 years old, normal delivery, birth weight 1.9kg. Parents are married to non-relatives. Visits manifested as stunting, Down’s face, microcephaly, right ear pus, no testicles, limb muscle tension is low. dyeing