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Classification and external resources
Specialty medical genetics
ICD-10 Q87.4 (ILDS Q87.410)
ICD-9-CM 759.82
DiseasesDB 15196
MedlinePlus 003288
MeSH D008382

Arachnodactyly ("spider fingers") or achromachia is a condition in which the fingers are abnormally long and slender in comparison to the palm of the hand. It can be present at birth or develop in later life.[citation needed].


This feature can occur on its own, with no underlying health problems. However, it can also be associated with certain medical conditions. Examples include Marfan syndrome,[1] Ehlers-Danlos syndrome,[2] Loeys–Dietz syndrome and homocystinuria.

Arachnodactyly has been linked to mutations in both fibrillin-1 and fibrillin-2 genes.

Notable cases[edit]

It remains unconfirmed whether composer Sergei Rachmaninoff's abnormally large reach on a piano was a result of arachnodactyly due to Marfan syndrome, as the pianist exhibited no other signs of the disease.[3]

See also[edit]


  1. ^ Buntinx, I. M.; Willems, P. J.; Spitaels, S. E.; Van Reempst, P. J.; De Paepe, A. M.; Dumon, J. E. (April 1991). "Neonatal Marfan syndrome with congenital arachnodactyly, flexion contractures, and severe cardiac valve insufficiency". Journal of Medical Genetics 28 (4): 267–273. doi:10.1136/jmg.28.4.267. ISSN 0022-2593. PMC 1016831. PMID 1856834. 
  2. ^ Keer, Rosemary; Grahame, Rodney (2003-06-27). "Hypermobility syndrome: Recognition and management for physiotherapists". ISBN 978-0-7506-5390-9. 
  3. ^