Table 4 Combinations of several MRI findings and their occurrence in PCNSL and GBM at the time of their initial evaluation

• Supratentorial

• Solitary infiltrative

• Non-homogenous enhancement

• Necrosis presence

3 (23.1%) of 13 solitary cases

(5.6% of all PCNSL)

28 (77.8%) of 36 solitary cases

(51.9% of all GBM)

<0.001

• Supratentorial

• Solitary infiltrative

• Non-homogenous enhancement

4 (30.8%) of 13 solitary cases

(7.4% of all PCNSL)

34 (94.4%) of 36 solitary cases

(63% of all GBM)

<0.001

• Multiple infiltrative

• Homogenous enhancement

27 (96.4%) of 28 multiple cases

(50% of all PCNSL)

0 (0%) of 18 multiple cases

(0% of all GBM)

<0.001

• Diffuse infiltrative type

• No necrosis

13 cases (24.1%

of all PCNSL)

0 (0%) of all GBM cases

<0.001

• Multiple infiltrative

• Non-homogenous enhancement

1(3.6%) of 28 multiple cases

(1.9% of all PCNSL)

18 (100%) of 18 multiple cases

(33.3% of all GBM)

<0.001