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Grades of injury, from mild stretch to deep injury. (A) A control (unstented) artery. (B, C) Almost 1:1 sizing (proximal end of stent) and even strut deployment lead to mild stretch and minimal neointimal growth. (D–G) Progressively more stretch is associated with a proportionately larger neointima. (H, I) Ruptured IEL affecting half (H) and the whole (I) vessel leads to pronounced neointimal growth. IEL, internal elastic lamina.
