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Syndrome reference sheet
Generated 12 Oct 2026
Genetics · Genetics / Single-gene syndromes Opitz–Kaveggia syndrome
Also known as: FG syndrome
X-linked intellectual disability with macrocephaly and imperforate anus.
- Medical specialty
- Genetics
- Subspecialty
- Genetics / Single-gene syndromes
- Sex & age distribution
- Male: affected, X-linked; Female: carriers; Children: yes
- Gene(s) involved
- CASK, FLNA, MED12, UPF3B, ZDHHC9
Etiology & mechanism
MED12 mutation.
Gene(s) involved (5)
CASKFLNAMED12UPF3BZDHHC9
Symptoms & signs (6)
agenesis of corpus callosumbroad thumbsconstipationhypotoniaimperforate anusmacrocephaly