Orphanet: N syndrome

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N syndrome

Disease definition

A rare, fatal multiple congenital anomalies/dysmorphic syndrome characterized by facial dysmorphism (incl. dolichocephaly/scaphocephaly, high frontal hairline, laterally overlapping upper eyelids, hypertelorism, prominent eyelashes, deep-set eyes, macrocornea, nystagmus, dysplastic ears, abnormal auricles, prominent nasal bridge, dental dysplasia), visual impairment, deafness, seizures, generalized skeletal dysplasia, high fingerprint ridge count, cryptorchidism, hypospadias, spasticity and severe intellectual disability. An increased chromosome breakage and a fatal lymphoid malignancy have been reported. There has been no further description in the literature since 1974.


Classification level: Disorder
  • Synonym(s): -
  • Prevalence: <1 / 1 000 000
  • Inheritance: X-linked recessive 
  • Age of onset: Infancy, Neonatal
  • ICD-10: Q87.8
  • OMIM: 310465
  • UMLS: C2936859
  • MeSH: C536108
  • GARD: 3902
  • MedDRA: -
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