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Table 2: Distribution of regional perivascular spaces by number and size^{^a}
Hemispheres and Regions No. of Perivascular Spaces Size (mm in Diameter) of Perivascular Spaces^{^b}
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
↵a Data are No. (%).
↵b There were missing values of perivascular space size in 1 subject in the mesencephalon (right hemisphere), 1 in the hippocampus (right hemisphere), and 1 in the basal ganglia (left hemisphere).