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Table 3: Detailed incidental findings in pooled studies^3–9
No. Available (Studies) Rate % (No.) 99% CI P (Heterogeneity) I²/Q Value
Normal variations 
    Mega cisterna magna 4428 (5) 2.5 (116) 0.8–7.4 <.001 78.0/22.7
    Cavum septum pellucidum 5653 (5) 2.2 (105) 1.1–4.6 .007 71.4/14.0
    Empty sella 3966 (1) 0.2 (7) 0.1–0.5 1 0/0
Cysts 5938 (7) 10.2 (1096) 3.1–28.5 <.001 98.0/306.4
    Pineal 5878 (6) 2.3 (704) 0.4–12.4 <.001 97.1/175.4
    Arachnoid 4256 (3) 2.2 (89) 1.7–2.9 .10 52.8/6.4
    Choroid plexus 4031 (2) 0.4 (8) 0.1–6.4 .04 75.6/4.1
    Porencephalic 4143 (3) 0.2 (4) 0.1–0.6 .05 69.7/5.8
Ventricular dilation 5656 (4) 1.1 (46) 0.1–12.4 <.001 95.5/65.9
Enlarged perivascular spaces 175 (2) 7.4 (24) 0.1–93.9 <.001 93.6/15.5
Vascular anomalies 
    Developmental venous anomaly 4256 (3) 1.6 (66) 1.1–2.1 .72 0/0.66
    Cavernoma 3966 (1) 0.2 (7) 0.1–0.5 1 0/0
    Capillary telangiectasia 3966 (1) 0.1 (2) 0–0.3 1 0/0
Developmental disorders 
    Gray matter heterotopia 4031 (2) 0.5 (19) 0.3–0.9 .75 0/0.1
    Gray matter dysplasia 3966 (1) 0.1 (2) 0–0.3 1 0/0
    Corpus callosum anomaly 4143 (3) 0.7 (7) 0.1–15.1 <.001 90.3/20.5
    Chiari I malformation 4263 (4) 0.8 (32) 0.5–1.3 .06 60.5/7.6
White matter hyperintensities 4428 (5) 1.9 (27) 0.2–16.8 <.001 94.6/73.6
Neoplasm 4368 (4) 0.2 (9) 0.1–0.6 .33 12.3/3.4