KnowraApert syndromeLinked fromLinked fromThe 4 pages that link to Apert syndrome, each with the reason it gives.All 4Related 2Compared with 2Crouzon syndromeCompared with: Unlike Crouzon syndrome, it characteristically includes syndactyly.Pfeiffer syndromeCompared with: Both can involve FGFR2, but extensive syndactyly is more characteristic of Apert syndrome.