(b).
| Sample | HR-MRI | |||||||
|---|---|---|---|---|---|---|---|---|
| TOF | Outer diameter | Wall thickening pattern | Enhancement on vessels | Pattern of enhancement | Signal intensity | Collateral vascular structures | Diagnosis by HR-MRI | |
| 1 | Bilateral ACA and MCA disappeared, replaced by moyamoya vessels | Shrinkage | Concentric | Y | Concentric | Homogeneous | Y | HR-MMD |
| 2 | Bilateral ACA and MCA disappeared, replaced by moyamoya vessels | Shrinkage | Concentric | Y | Concentric (eccentric enhancement on the MCA distal) | Homogeneous | Y | HR-MMD |
| 3 | Moderate stenosis in M2 of left MCA | Normal | Eccentric | Y | Eccentric | Homogeneous | N | HR-ICAD |
| 4 | Occlusion of left MCA, moderate to severe stenosis of right MCA | Shrinkage | Concentric | Y | Concentric | Homogeneous | Y | HR-MMD |
| 5 | Mild stenosis of left MCA, occlusion of right MCA | Shrinkage | Concentric | — | — | Homogeneous | Y | HR-MMD |
| 6 | Moderate stenosis of right MCA | Shrinkage | Concentric | Y | Concentric | Homogeneous | Y | HR-MMD |
| 7 | Occlusion of left MCA, mild stenosis of right MCA | Shrinkage | Concentric | — | — | Homogeneous | Y | HR-MMD |
| 8 | Severe stenosis of left MCA | Normal | Eccentric | Y | Eccentric | Homogeneous | N | HR-ICAD |
| 9 | Occlusion of left MCA | Shrinkage | Concentric | N | Concentric | Homogeneous | Y | HR-MMD |
Note: F: female; M: male; HT: hypertension; HL: hyperlipidemia; DM: diabetes mellitus; FH: family history; HHcy: hyperhomocysteinemia; Y: yes; N: no.