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Table 2 Radiographic and surgical tumor characteristics of 33 patients

From: Extradural anterior clinoidectomy in surgical management of clinoidal meningiomas

ACMs characteristics No. of patients Percentage
Al-Mefty’s classification
Type I 14 (42.4%)
Type II 17 (51.5%)
Type III 2 (6.1%)
Site (Rt/Lt) 11/22 33.3%/66.6%
Size
Mean (range) 4.1 (1.8–7.6)  
< 4 cm 16 (48.5%)
> 4 cm 17 (51.5%)
T2-MRI tumor intensity
Hypointense 14 (42.4%)
Isointense 7 (21.2%)
Hyperintense 12 (36.4%)
Peritumoral edema 20 (60.6 %)
Tumor calcifications 14 (42.4%)
Central or peripheral 7 (21.2%)
Marked 7 (21.2%)
ACP-Hypertrophy 19 (57.6%)
OCI 24 (72.7%)
CS invasion 8 (24.2%)
ICA relation
Group A 17 (51.5%)
Group B 9 (27.3%)
Group C 6 (18.2%)
Group D 1 (3.0%)
  1. ACMs anterior clinoidal meningiomas, Rt right, Lt left