[Congenital oral pits: report of a case].

Normal morphogenesis of oro-facial tissues includes a complete, step-by-step sequence of cell migration and of interaction between groups of cells; mechanisms responsible for dysmorphogenesis are, however, still unknown. Lips are frequent target structures for these malformations, a variety of which are congenital labial fistula. The present paper reviews current literature on the subject an submits a case history illustrating this alteration.