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Table 4: 
IIH-related MR imaging findings before venous sinus stent placement and at 6-month follow-upa
MR Imaging FindingsEvaluation Possible (%) (No.)Before Venous Sinus Stent PlacementAt 6-Month Follow-UpP 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 globe38.5% (10)84.6% (22)
Posterior globe flattening30.8% (8)15.4% (4)
Posterior globe flattening with optic nerve protrusion30.8% (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%]).