Arachnodactyly

Alternative Names: Dolichostenomelia; Spider fingers; Achromacria

Arachnodactyly is a physical condition in which the fingers are long, slender, and curved, resembling a spider's legs.

Considerations

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 disease.

Causes of Arachnodactyly

• Homocystinuria
• Marfan syndrome
• Other rare genetic disorders

Note: Having long, slender fingers may be normal.

When to Contact a Health Professional

Some children are born with arachnodactyly, although it may develop over time. Consult with your health care provider during a routine examination if your child has long, slender fingers and you are concerned that an underlying condition may exist.

The health care provider will perform a physical exam and ask questions about the patient's medical history, including:

• Time pattern
  • When did you first notice the fingers being shaped like this?
• Family history
  • Is there any family history of early death?
  • Is there any family history of known hereditary disorders?
• Symptoms
  • What other symptoms are also present?
  • Have you noticed any other unusual things?

Diagnostic tests are usually not necessary unless a hereditary disorder is suspected.

Review Date: 1/29/2010
Reviewed By: Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

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