We report 2 cases of mandibulofacial dysostosis with microcephaly (MFDM) with different and novel de novo mutations in the elongation factor Tu GTP binding domain containing 2 gene. Both cases were initially thought to have alternative disorders but were later correctly diagnosed through whole-exome sequencing. These cases expand upon our knowledge of the phenotypic spectrum in patients with MFDM， which will aid in defining the full phenotype of this disorder and increase awareness of this condition.

computerized tomography，craniofacial morphology，dysmorphology，etiology，facial morphology，genetics，hearing loss，hemifacial microsomia，mutation，pediatrics，psychiatric conditions，synost