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FGFR2-related bent bone dysplasia

Disease definition

FGFR2-related bent bone dysplasia is a rare, genetic, lethal, primary bone dysplasia characterized by dysmorphic craniofacial features (low-set, posteriorly rotated ears, hypertelorism, megalophtalmos, flattened and hypoplastic midface, micrognathia), hypomineralization of the calvarium, craniosynostosis, hypoplastic clavicles and pubis, and bent long bones (particularly involving the femora), caused by germline mutations in the FGFR2 gene. Prematurely erupted fetal teeth, osteopenia, hirsutism, clitoromegaly, gingival hyperplasia, and hepatosplenomegaly with extramedullary hematopoiesis may also be associated.


Classification level: Disorder
  • Synonym(s):
    • Perinatal lethal bent bone dysplasia
  • Prevalence: <1 / 1 000 000
  • Inheritance: Autosomal dominant 
  • Age of onset: Neonatal, Antenatal
  • ICD-10: -
  • OMIM: 614592
  • UMLS: -
  • MeSH: -
  • GARD: 10965
  • MedDRA: -
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