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Table 2: Empiric distribution summaries for the preoperative MR imaging metrics according to LGG molecular subtype
MR Imaging Metric IDHmut-Codel IDHmut-Noncodel IDHwt
Tumor size (cm) 
 Median 6.6 6.9 6.2
 IQR (1st to 3rd quartile) (5.2–8.6) (5.3–9.3) (4.6–8.4)
 Range (minimum–maximum) (1.9–14.2) (1.7–15.3) (1.1–15.0)
Location 
 Central 26 (25.0%) 43 (33.3%) 29 (39.7%)
 Peripheral 78 (75.0%) 86 (66.7%) 44 (60.3%)
No. of involved lobes 
 Median 2.0 2.0 2.0
 IQR (1st to 3rd quartile) (1.0–3.0) (1.0–3.0) (1.0–3.0)
 Range (minimum–maximum) (1.0–6.0) (1.0–9.0) (1.0–8.0)
Corpus callosum extension 44 (42.3%) 46 (35.7%) 18 (24.2%)
Hydrocephalus 12 (11.5%) 27 (20.9%) 7 (9.6%)
Midline shift (cm) 
 Median 0.00 0.30 0.00
 IQR (1st to 3rd quartile) (0.00–0.43) (0.00–0.80) (0.00–0.10)
 Range (minimum–maximum) (0.00–2.70) (0.00–1.90) (0.00–1.40)
Eloquent cortex 33 (31.7%) 45 (34.9%) 24 (32.9%)
Ependymal extension 65 (62.5%) 80 (62.0%) 58 (79.5%)
Margin 
 <33% sharp/circumscribed 32 (30.8%) 31 (24.0%) 28 (38.4%)
 33%–66% sharp/circumscribed 55 (52.9%) 38 (29.5%) 31 (42.5%)
 >66% sharp/circumscribed 17 (16.3%) 60 (46.5%) 14 (19.2%)
Contrast enhancement 21 (31.8%) 51 (39.5%) 30 (41.1%)
Necrosis 17 (16.3%) 14 (10.9%) 18 (24.7%)