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Classification and external resources
ICD-10 Q87.4 (ILDS Q87.410)
ICD-9 759.82
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. In some cases, all or a few fingers may be bent backwards by 180 degrees[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.  edit
  2. ^ Keer, Rosemary; Grahame, Rodney (2003-06-27). "Hypermobility syndrome: Recognition and management for physiotherapists". ISBN 978-0-7506-5390-9. 
  3. ^