涉及F组染色体的异常较为少见。20p三体患儿出生前后生长基本正常,无相关疾患,往往因走路和语言发育推迟而引起大人注意[1]。主要症状有:精神发育迟滞,生长正常,特征性的圆脸,运动协调性差,语言能力差。由父母平衡易位引起20p三体同时伴有相关染色体缺失,或相关基因的干扰,而出现其他异常。2010年我们发现1例,报告如下。 Chromosome abnormalities involving Group F are rare. 20p trisomy children before and after the birth of growth was normal, no related disorders, often due to delays in walking and language development caused by adult attention [1]. The main symptoms are: mental retardation, normal growth, characteristic round face, poor motor coordination, poor language skills. Balance by the parents caused by 20p trisomy accompanied by associated chromosome deletion, or related gene interference, and other abnormalities. In 2010 we found 1 case, the report is as follows.