Arachnodactyly is a condition in which the fingers are long, slender, and curved. They look like the legs of a spider (arachnid).
Dolichostenomelia (refers to a long, slender body, not just fingers); Spider fingers; Achromacria
Long, slender fingers can be normal and not associated with any medical problems. In some cases, however, "spider fingers" can be a sign of an underlying disorder.
Causes may include:
- Marfan syndrome
- Other rare genetic disorders
Note: Having long, slender fingers may be normal.
When to Contact a Medical Professional
Some children are born with arachnodactyly. It may become more noticeable over time. Talk to your health care provider during a routine exam if your child has long, slender fingers and you are concerned that an underlying condition may exist.
What to Expect at Your Office Visit
The provider will perform a physical exam and ask questions about the person's medical history, including:
- When did you first notice the fingers being shaped like this?
- Is there any family history of early death? Is there any family history of known hereditary disorders?
- What other symptoms are present? Have you noticed any other unusual things?
Diagnostic tests are most often not necessary unless a hereditary disorder is suspected.
Doyle Al, Doyle JJ, Dietz HC. Marfan syndrome. In: Kliegman RM, Stanton BF, St Geme JW, Schor NF, eds. Nelson Textbook of Pediatrics. 20th ed. Philadelphia, PA: Elsevier; 2016:chap 702.
Herring JA. Orthopaedic-related syndromes. In: Herring JA, ed. Tachdjian's Pediatric Orthopaedics. 5th ed. Philadelphia, PA: Elsevier Saunders; 2014:chap 41.