A previously undescribed de novo 4p15 deletion in a patient with apparently isolated metopic craniosynostosis.

Interstitial deletion of the short arm of chromosome 4, excluding cytoband p16, has been described as a distinct phenotype from the Wolf-Hirschhorn syndrome, characterized by a deletion encompassing cytoband p16. We report on the case of a 14-month-old boy with an apparently isolated craniosynostosis and harboring a de novo microdeletion in band 4p15. The imbalance, about 4 Mb in size is, to date, the smallest deletion ever described in this region, encompassing 12 genes.