Table 2:

CT findings

CharacteristicValue
Patterns (No. of patients) (%)
    Pseudotumoral21 (87.5)
    Meningeal1 (4.1)
    Pseudotumoral + meningeal (combined)2 (8.3)
    Calcifications (No. of patients) (%)0 (0)
    Perilesional edema (No. of patients) (%)a19 (90.4)
    Hydrocephalus (No. of patients) (%)6 (25.0)
    Hemorrhage (No. of patients) (%)b3 (13.0)
No. of lesionsb
    Mean (range)3.0 (1–11)
Subgroup (No. of patients) (%)
    Single lesions9 (39.1)
    2–511 (47.8)
    6–102 (8.6)
    >101 (4.3)
Lesion size (No. of patients) (%)b
    >2 cm15 (65.2)
Larger axial diameter of the major lesionb
    Mean (range) (cm)2.6 (0.3–5.6)
CT attenuation (No. of patients) (%)c
    Hyperattenuating lesions11 (20.7)
    Hypoattenuating lesions30 (56.6)
    Hypoattenuating center and hyperattenuating    margin12 (22.6)
CT or MR imaging contrast enhancement (No. of    patients) (%)
    Ring enhancement17 (70.8)
    Nodular enhancement3 (12.5)
    Ring and nodular enhancement3 (12.5)
    Leptomeningeal enhancement1 (4.1)

  • ↵a This category considered only in the 21 patients with pseudotumoral form.

  • ↵b These categories excluded the patient with the meningeal form isolated.

  • ↵c Seven patients did not have CT scans and were eliminated from the calculations.