患儿，女，15岁，因原发性闭经，伴有嗅觉障碍就诊。完善检查提示为低促性腺激素性性腺功能减退症，初步诊断为Kallmann综合征。经全外显子组测序发现患儿存在CHD7基因c.5238_5239del（p.Tyr1746*）新发杂合变异，依据美国医学遗传学与基因组学学会变异解读指南，该变异为疑似致病变异。结合典型临床表现，该患儿确诊为CHD7基因杂合变异所致的Kallmann综合征。该病例丰富了Kallmann综合征基因变异谱，为临床医生对该病的认识提供参考。

This article reports the case of a 15-year-old girl with primary amenorrhea and olfactory dysfunction. Evaluation demonstrated hypogonadotropic hypogonadism, and an initial clinical diagnosis of Kallmann syndrome was made. Whole-exome sequencing identified a novel heterozygous CHD7 variant, c.5238_5239del(p.Tyr1746*), which was classified as likely pathogenic according to the variant interpretation guidelines of the American College of Medical Genetics and Genomics. In light of the typical clinical phenotype and genetic findings, the patient was diagnosed with CHD7-related Kallmann syndrome. This case broadens the CHD7 mutational spectrum in Kallmann syndrome and provides valuable insights to inform clinicians' understanding of this disease.