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Takayasu arteritis

“ This is a large-vessel arteritis tending to affect young women.  There is granulomatous inflammation of the vessel wall, with vessels ulti...

This is a large-vessel arteritis tending to affect young women. 
There is granulomatous inflammation of the vessel wall, with vessels ultimately becoming stenotic, occluded or aneurysmal.
CT

•  Vessel wall thickening and enhancement.
 Aorta (thoracic particularly) and its branches are mostly affected.
•  Pulmonary arteries affected in 50%, peripheral pulmonary arteries may be ‘pruned’, trunk dilated.
•  Vessels calcify in chronic disease (otherwise they are more likely to become aneurysmal).

MRI
•  Look for high signal on the short tau inversion recovery (STIR) in the vessel wall, indicating oedema.