Heterozygous deletion of the VEGFC gene in 4q34.3 is associated with Milroy‐like lymphedema: First prenatal case report

Deleterious variants in the vascular endothelial growth factor C (VEGFC) gene have been recently associated with Milroy‐like primary lymphedema, an autosomal dominant disorder, characterized mainly by swelling of the lower limbs due to functional impairment of the lymphatic vessels. To date, only 26 patients with congenital lymphedema harboring VEGFC pathogenic variants were documented. Here, we describe the first prenatal case of a fetus with Milroy‐like disease. Fetal ultrasound showed bilateral foot swelling. Chromosomal microarray analysis revealed a 137‐kb copy number loss in 4q34.3 including only VEGFC gene in the propositus fetus. Segregation analysis showed that the deletion was inherited from the affected mother and grandmother. Taken together, our study highlights the important role of microarray analysis to detect subtle chromosomal imbalances in the prenatal setting and contributes to delineate the fetal phenotype of VEGFC‐related primary congenital lymphedema.