The exact causes of<unk>  are currently unknown. Mutations of the ACP2 gene have been implicated but not confirmed. One case of siblings — both with<unk>  — has been observed, showing possible evidence of recessive inheritance. The Brazilian parents of these siblings showed some degree of inbreeding, being first cousins. Five of the 34 people diagnosed with<unk>  have also come from Brazil. Lack of expression from the WNT1, FGF8, FGF17, OTX2, fgf8, and fgf17 genes have all been implicated as possibly being the cause of cerebellum fusion.
Gómez–López-Hernández syndrome
Naegeli–Franceschetti–Jadassohn syndrome
Arakawa's syndrome II
Löffler's syndrome
Lucey–Driscoll syndrome
Grisel's syndrome
Wissler's syndrome
Sanjad-Sakati syndrome