Table 4.
Frequency of brain lesion components by subgroups in plain CT and MRI
| All types of lesion components | CT [29 lesions] |
MRI [162 lesions] |
Lesions identified on MRI only [137 lesions] |
Lesions identified on CT only [4 lesions] |
||||
|---|---|---|---|---|---|---|---|---|
| N * | %** | N * | %** | N * | %** | N * | %** | |
| Large ischemia (> 5 mm) | 21 | 58 | 33 | 18 | 19 | 12 | 4*** | 100 |
| Punctuate ischemia (≤ 5 mm) | 1 | 3 | 30 | 16 | 29 | 18 | 0 | 0 |
| Intraparenchimal hemorrhage | 7 | 19 | 11 | 6 | 4 | 3 | 0 | 0 |
| CMBs | 2 | 6 | 97 | 53 | 96 | 61 | 0 | 0 |
| SAH | 2 | 6 | 8 | 4 | 6 | 4 | 0 | 0 |
| Abscess (> 5 mm) | 3 | 8 | 4 | 2 | 4 | 3 | 0 | 0 |
| Microabscess (≤ 5 mm) | 0 | 0 | 0 | 0% | 0 | 0 | 0 | 0 |
| Meningitis | 0 | 0 | 0 | 0% | 0 | 0 | 0 | 0 |
| Total | 36 | 100 | 183 | 100 | 158 | 100 | 4 | 100 |
* Each lesion can have multiple components, so that the total number of components may exceed the number of lesions
** This percentage is calculated on the overall number of components
*** These were false positives on CT: round hypodensities in the white matter that were considered recent ischemic lesions but were frankly old ischemic on MRI
Note: CT, computed tomography; MRI, magnetic resonance imaging; CMBs, cerebral microbleeds; SAH, subarachnoid hemorrhage