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TABLE 1: Conventional MR imaging findings in primitive neuroectodermal tumors
Patient No. Volume (cm³) T1 Signal T2 Signal Enhancement^* (%) Edema Mass Effect Necrotic/Cystic Lesion Delineation Heterogeneity Calcification
1 5 × 3 × 2.5 Iso Iso 50 + + Yes Well Yes Yes
2 2.5 × 2 × 2 Iso Hypo 90 − + Yes Well Yes No
3 6 × 6 × 6 Hypo Iso 30 ++ +++ Yes Well Yes No
4 6 × 6 × 6 Hypo Iso 80 + ++ Yes Well Yes No
5 3.5 × 2.5 × 1.5 Iso Hyper 70 ++ + Yes Well Yes No
6 3.5 × 4 × 3 Hypo Hyper 50 + ++ Yes Ill Yes Yes
7 5 × 3 × 2 Iso Iso 50 + + Yes Ill Yes No
8 2.5 × 1.5 × 2 Iso Hyper 80 − − No Well No No
9 3 × 3 × 3 Iso Hyper 90 + + No Well Yes No
10 7 × 6 × 5 Iso Iso 30 ++ +++ Yes Well Yes Yes
11 1.5 × 2 × 2 Iso Hypo 50 +++ + Yes Well Yes No
12 1 × 1 × 1 Iso Hypo 50 − − No Well No No
Note.—Iso indicates isointense to gray matter; Hypo, hypointense; Hyper, hyperintense; +, mild; ++, moderate; +++, severe.
* Enhancement is shown as the percentage of the lesion volume that enhanced.