[Inclusion dermoid cyst of the anterior fontanel region in adults: report of a case]. Cisto dermóide de inclusão localizado na região da fontanela anterior no adulto: apresentação de um caso. The author describes one case of congenital inclusion dermoid cyst located over the region of the anterior fontanel in an adult patient aged 24 years. The question of racial prevalence is discussed and considerations on the incidence of these cysts in adult patients are made based on the review of cases previously reported in the literature.