Arachnodactyly-Pictures, Diagnosis, Causes

What is Arachnodactyly?

Arachnodactyly or ‘spider fingers’ is a physical condition in which the fingers of a person may be thin and long resembling like legs of a spider. In some cases, even the toes can be spider-like. Though, this condition can develop on its own or may be present at birth, arachnodactyly is one of the symptoms of Marfan Syndrome, Homocystinuria and Ehlers–Danlos syndrome (EDS)

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Arachnodactyly is caused to mutations in fibrillin-1 and fibrillin-2 genes. Marfan Syndrome is caused due to a mutant gene that affects one in every 5000 to 10000 people. But at the same time, one may note that having long, slender fingers is not abnormal.

When to check with a doctor

If as a parent, you are concerned that your child has long, thin fingers and it may be related to some syndrome like Marfan, you may express it to the doctor during a routine examination.


The doctor may ask you questions like when you first see the fingers in this kind of shape; if you or your spouse has a family history of genetic disorders and if there was an early death in the family due to hereditary problems. The doctor may also look into other symptoms that may equate with Marfan syndrome and Ehlers–Danlos syndrome. In fact, the doctor will conduct tests and diagnosis only if he suspects a hereditary disorder.


This is a physical feature so there is nothing to be done about treating it. Since it may be a symptom of Marfan syndrome, it is important to treat other physical conditions that may escalate like vision problems, aorta-related issues etc. Medications are given to slow down the heart-rate, treat blood pressure and correct vision problems. Read more about treatment for Marfan Syndrome.

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Arachnodactyly Pictures

Check out the photo of Arachnodactyly to see how long and slender the fingers look

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