Distribution of regional perivascular spaces by number and sizea
| Hemispheres and Regions | No. of Perivascular Spaces | Size (mm in Diameter) of Perivascular Spacesb | ||||||
|---|---|---|---|---|---|---|---|---|
| None | 1–5 | 6–10 | >10 | None | 1–2 | 3–4 | >4 | |
| Left | ||||||||
| Frontal | 32 (6.0) | 70 (13.2) | 107 (20.2) | 321 (60.6) | 32 (6.0) | 473 (89.3) | 25 (4.7) | 0 |
| Parieto-occipital | 25 (4.7) | 68 (12.8) | 116 (21.9) | 321 (60.6) | 25 (4.7) | 486 (91.7) | 16 (3.0) | 3 (0.6) |
| Basal ganglia | 0 | 85 (16.0) | 240 (45.3) | 205 (38.7) | 0 | 443 (83.6) | 80 (15.1) | 7 (1.3) |
| Subinsular | 128 (24.2) | 277 (52.3) | 107 (20.2) | 18 (3.4) | 128 (24.2) | 370 (69.9) | 30 (5.7) | 1 (0.2) |
| Hippocampus | 156 (29.4) | 328 (61.9) | 46 (8.7) | 0 | 156 (29.4) | 348 (65.7) | 26 (4.9) | 0 |
| Mesencephalon | 255 (48.1) | 274 (51.9) | 0 | 0 | 254 (47.9) | 273 (51.5) | 3 (0.6) | 0 |
| Cerebellum | 456 (86.0) | 74 (14.0) | 0 | 0 | 456 (86.0) | 74 (14.0) | 0 | 0 |
| Right | ||||||||
| Frontal | 28 (5.3) | 64 (12.1) | 94 (17.7) | 344 (64.9) | 28 (5.3) | 474 (89.4) | 27 (5.1) | 1 (0.2) |
| Parieto-occipital | 29 (5.5) | 79 (14.9) | 106 (20.0) | 316 (59.6) | 29 (5.5) | 487 (91.9) | 14 (2.6) | 0 |
| Basal ganglia | 1 (0.2) | 103 (19.4) | 231 (43.6) | 195 (36.8) | 1 (0.2) | 452 (85.3) | 63 (11.9) | 14 (2.6) |
| Subinsular | 131 (24.7) | 280 (52.8) | 103 (19.4) | 16 (3.0) | 131 (24.7) | 369 (69.6) | 29 (5.5) | 1 (0.2) |
| Hippocampus | 210 (39.6) | 284 (53.6) | 35 (6.6) | 1 (0.2) | 209 (39.5) | 292 (55.2) | 26 (4.9) | 2 (0.4) |
| Mesencephalon | 263 (49.6) | 265 (50.0) | 2 (0.4) | 0 | 262 (49.5) | 263 (49.7) | 4 (0.8) | 0 |
| Cerebellum | 462 (87.2) | 68 (12.8) | 0 | 0 | 463 (87.4) | 67 (12.6) | 0 | 0 |