A few hundred people have been documented with the condition worldwide. Once thought to have an incidence of 1 in 1,000,000, some research has suggested the incidence may be as high as 1 in 40,000
Wiedemann–Steiner syndrome
Beckwith–Wiedemann syndrome
Wiedemann–Rautenstrauch syndrome
Laurence–Moon syndrome
Bardet–Biedl syndrome
Wilson–Turner syndrome
Miller–Dieker syndrome
Smith–Magenis syndrome