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Neurofibromatosis-Noonan syndrome

Synonym(s) NFNS
Neurofibromatosis type 1-Noonan syndrome
Prevalence Unknown
Inheritance Autosomal dominant
Age of onset Infancy
  • Q87.1
  • C0553586
  • C2931482
  • C537393
  • D009456
MedDRA -


Disease definition

Neurofibromatosis-Noonan syndrome (NFNS) is a RASopathy and a variant of neurofibromatosis type 1 (NF1; see this term) characterized by the combination of features of NF1, such as café-au-lait spots, iris Lisch nodules, axillary and inguinal freckling, optic nerve glioma and multiple neurofibromas; and Noonan syndrome (NS; see this term), such as short stature, typical facial features (hypertelorism, ptosis, downslanting palpebral fissures, low-set posteriorly rotated ears with a thickened helix, and a broad forehead), congenital heart defects and unusual pectus deformity. As these three entities have significant phenotypic overlap, molecular genetic testing is often necessary for a correct diagnosis (such as when café-au-lait spots are present in patients diagnosed with NS).

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