Granulomatous inflammation of the media and adventitia of large elastic arteries.
- F:M 10:1 (i.e. Asian women)
- Typically affects thoracic vessels, most common left subclavian artery, also pulmonary arteries
- Thickened vessel walls with smooth long segment stenosis and occlusion
- Elevated SED rate
Angiographically similar to Giant Cell Arteritis, but young population verus older.