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Anonychia congenita

Other Names for this Disease
  • Anonychia
  • Hyponychia congenita
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Anonychia congenita is an extremely rare nail disorder characterized by the complete absence (anonychia) or abnormally developed  fingernails and toenails. Affected individuals usually do not have hair, teeth, or bone abnormalities. Signs and symptoms are variable, even among affected members of the same family. Less than 20 individuals with anonychia congenita have been identified. This condition is thought to be caused by mutations in the RSPO4 gene and inherited in an autosomal recessive fashion.[1][2]
Last updated: 9/27/2012


  1. Congenital anonychia. Orphanet. May 2007; Accessed 11/4/2011.
  2. Nail disorder, nonsyndromic congenital, 4: NDNC4. Online Mendelian Inheritance of Man (OMIM). August 2011; Accessed 11/4/2011.
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In Depth Information

  • The Online Mendelian Inheritance in Man (OMIM) is an catalog of human genes and genetic disorders. Each entry has a summary of related medical articles. It is meant for health care professionals and researchers. OMIM is maintained by Johns Hopkins University School of Medicine. 
  • Orphanet is a European reference portal for information on rare diseases and orphan drugs.  Access to this database is free of charge.
  • PubMed is a searchable database of medical literature and lists journal articles that discuss Anonychia congenita. Click on the link to view a sample search on this topic.