Table 2. Plaque-calcification-pattern based plaque classification for the differentiation of stable and unstable lesions confirmed by histopathologic findings.
| Plaque-calcification-pattern scheme | Stable | Unstable | In total |
|---|---|---|---|
| No plaque, n (%) | 87 (41.8) | 0 (0) | 87 (24.3) |
| CP, n (%) | 21 (10.1) | 4 (2.7) | 25 (7.0) |
| NCP, n (%) | |||
| With NRS (NCP-NRS) | 3 (1.4) | 20 (13.3) | 23 (6.4) |
| Without NRS (NCP-non-NRS) | 57 (27.4) | 29 (19.3) | 86 (24.0) |
| MP, n (%) | |||
| With DAS (MP-DAS) | 6 (2.9) | 59 (39.3) | 65 (18.2) |
| Without DAS (MP-non-DAS) | 34 (16.4) | 38 (25.3) | 72 (20.1) |
| In total | 208 (100.0) | 150 (100.0) | 358 (100.0) |
Note: P<0.0001. CP, calcified plaque; NCP, non-calcified plaque; NRS, napkin-ring-sign; MP, mixed plaque; DAS, diamond-attenuation-sign.