Table 2 Variables observed on MRI.

From: Pleomorphic xanthoastrocytomas of adults: MRI features, molecular markers, and clinical outcomes

Variable Number (n = 50)
Median size (mm) 44 (13–80)
Number
  Single lesion 47 (94%)
  Multiple lesions 3 (6%)
Location
  Single lesion (n = 47)  
    Frontal lobe 12 (26%)
    Temporal lobe 17 (36%)
    Parietal lobe 4 (9%)
    Occipital lobe 1 (2%)
    Frontal-temporal lobe 3 (6%)
    Temporal-parietal lobe 1 (2%)
    Temporal-occipital lobe 4 (9%)
    Parietal-occipital lobe 1 (2%)
    Lateral ventricle 2 (4%)
    Dorsal midbrain 1 (2%)
    Thalamus 1 (2%)
  Multiple lesions (n = 3)
    Frontal lobe, temporal-parietal lobe, insular lobe and corpus callosum 1
    Parietal lobe, temporal lobe 1
    Frontal lobe, occipital lobe and lateral ventricle 1
Superficial and attached to the meninges 22 (44%)
Adjacent to and invasion of the lateral ventricles 9 (18%)
Hemorrhage 9 (18%)
Degree of peritumoral edema
  No 9 (18%)
  Mild (<10 mm diameter) 11 (22%)
  Moderate to severe (≥10 mm diameter) 30 (60%)
Imaging pattern
  Predominantly solid 33 (66%)
  Predominantly cystic with a mural nodule 14 (28%)
  Predominantly cystic without a mural nodule 3 (6%)
Enhancement pattern in the solid component (n = 47)
  Mild 1 (2%)
  Marked 46 (98%)
Enhancement pattern in the cystic wall (n = 17)
  No 7 (41%)
  Mild 2 (12%)
  Marked 8 (47%)
DWI parameters
  Mean ADC (×10−3 mm2/s) 0.83 ± 0.17 (0.58–1.42)
  Mean ADC ratio 1.02 ± 0.22 (0.68–1.66)