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Fig. 1C. —Drawings show classification of patterns of aortic wall changes in Takayasu's arteritis on high-resolution contrast-enhanced T1-weighted spin-echo MR images. Innermost zone is revealed as brighter than middle gray zone. Outer zone is brightest of three layers and indistinguishable from surrounding fat. In type C, innermost and middle layers are not separable because they have equal signal intensity. a = adventitia, periadventitial fat, or both.

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