Detailed incidental findings in pooled studies3–9
| 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 |