Giant cell arteritis is a common form of vasculitis in people aged 50 years or older. The extracranial branches of the carotid artery are usually affected. Kenneth J. Warrington, Professor of Medicine, Mayo Clinic College of Medicine, gives us an overview of the condition. For more on giant cell arteritis, visit BMJ Best Practice: bestpractice.bmj.com/topics/en-gb/177 -

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