IIH-related MR imaging findings before venous sinus stent placement and at 6-month follow-upa
| MR Imaging Findings | Evaluation Possible (%) (No.) | Before Venous Sinus Stent Placement | At 6-Month Follow-Up | P Values |
|---|---|---|---|---|
| Meckel cave (mm) | 100% (26/26) | 4.3 (4.0–4.9) | 4.1 (3.4–5.1) | .096 |
| Empty sella (mm) | 100% (13/13) | 4.9 (3.5–6.9) | 4.9 (3.2–7.0) | .753 |
| Tonsillar ectopia (mm) | 100% (13/13) | −1.1 (−1.9 to –1.9) | −0.67 (−1.3 to −0.9) | .600 |
| Lateral ventricles (mm) | 100% (13/13) | 31.5 (29.4–34.6) | 32.2 (29.7–34.6) | .124 |
| Third ventricle corpus (mm) | 100% (13/13) | 3.7 (3.2–4.2) | 4.5 (3.5–5.2) | .075 |
| Optic nerve sheath diameter (mm) | 100% (26/26) | 6.8 (6.2–7.3) | 6.1 (5.9–6.5) | .000 |
| Optic nerve protrusion (%) | 100% (26/26) | |||
| Posterior globe involvement (%) | 100% (26/26) | .001 | ||
| Normal convexity of the optic globe | 38.5% (10) | 84.6% (22) | ||
| Posterior globe flattening | 30.8% (8) | 15.4% (4) | ||
| Posterior globe flattening with optic nerve protrusion | 30.8% (8) | 0.0% (0) | ||
| Extracranial findings | ||||
| Proximal emissary vein (mm) | 84.6% (11/13) | 1.6 (0.6–2.3) | 1.6 (0.6–2.4) | .790 |
| Subcutaneous fat thickness in the scalp (mm) | 100% (13/13) | 4.1 (3.8–4.3) | 4.1 (3.5–4.6) | .834 |
| Subcutaneous fat thickness in the neck (mm) | 100% (13/13) | 8.9 (7.3–11.2) | 7.4 (5.9–8.3) | .001 |
↵a Data are expressed as percentages (No.) or median (interquartile range [25%–75%]).