Hyperplasia of midfaceHyperplasia of midface is a condition in which the infraorbital and perialar regions are anteriorally positioned, facial convexity is increased, and/or the nasolabial angle is increased.Syndromes (conditions)Hyperplasia of midface is seen in the following conditions and syndromes: Craniofacial dysplasia - osteopenia syndrome Polyhydramnios, megalencephaly, and symptomatic epilepsy Seckel syndrome Troyer syndrome