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Table 5: Over- and underestimation of nidus obliteration on MRI₂
Overestimation of Nidus Obliteration on MRI₂ (n = 6 patients, 8 observations) Underestimation of Nidus Obliteration on MRI₂ (n = 49 patients, 65 observations)
Mean age (yr) 29.3 (14.0–44.7)^a 37.4 (33.1–41.7)^a
bAVM volume (mL) 4.3 (0.2–8.5)^a 3.3 (2.3–4.2)^a
bAVM score 1.10 (0.57–1.63)^a 1.11 (0.98–1.25)^a
SM gradation (%) 
    I 1 (17%) 9 (18.4%)
    II 0 21 (42.9%)
    III 4 (67%) 16 (32.7%)
    IV 1 (17%) 2 (4.1%)
    V 0 0
Unclassifiable N/A 1 (2.0%)
Drainage (%) 
    Superficial 2 (33%) 32 (65.3%)
    Deep 4 (67%) 16 (32.7%)
    Unclassifiable N/A 1 (2.0%)
Previous embolization (%) 2 (33%) 30 (61.2%)
Treatment dose (cGy) 1900 (1643–2157)^a 1935 (1874–1996)^a
Location (%) 
    Corpus callosum N/A 1 (2%)
    Cerebellum N/A 6 (12.2%)
    Frontal N/A 11 (22.4%)
    Occipital 2 (33%) 7 (14.3%)
    Parietal 2 (33%) 11 (22.4%)
    Temporal 1 (17%) 10 (20.4%)
    Thalamic 1 (17%) 3 (6.1%)
Interval MRI₂-DSA₂ (mo) 7.1 (4.1–10.1)^a 2.5 (0.5–4.6)^a

Note:—N/A, not applicable, SM, Spetzler-Martin grade.

↵a The ranges in parentheses refer to the 95% CI.