Background: De novo or rare transmitted mutations in the SMAD6 gene affect 7 percent of midline nonsyndromic synostosis patients. This study aimed to determine the neurocognitive sequelae of SMAD6 synostosis.
Methods: Nonsyndromic synostosis patients 6 years or older with SMAD6 mutations and non-SMAD6 nonsyndromic synostosis controls were recruited.