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Figure 2 Semiquantitative Classification of CTCA
The white lines on the figures show the sites of stents. A to D are Grade 1 (none or slight neointimal proliferation). (A) Two Cypher stents placed in the left main artery (3.5 x 18 mm) and the proximal left anterior descending artery (LAD) (3.5 x 23 mm). (B) A cross-section of the Cypher stent placed in the left main (LM) artery. (C) A cross-section of a Cypher stent placed in the LM. (D) Invasive coronary angiography (ICA) of the left coronary artery (LCA). E to G are Grade 2 (mild neointimal proliferation but no significant restenosis [<50% narrowing]). (E) A Cypher stent (3.5 x 23 mm) placed in the proximal LAD. (F) A cross-section. (G) An ICA of the LCA. H to J are Grade 3 (moderate neointimal proliferation with significant restenosis [ 50% narrowing]). (H) A Cypher stent (3.5 x 23 mm) placed in the proximal right coronary artery (RCA). (I) A cross-section. (J) An ICA of the RCA. K to M are Grade 4 (neointimal proliferation with severe stenosis or total occlusion [75% narrowing or occlusion]). (K) A Cypher stent (3 x 28 mm) placed in the proximal LAD. (L) A cross-section. (M) An ICA of the LCA. CTCA = computed tomographic coronary angiography.
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