About Glioblastoma multiforms.. associated with neurofibromatosis type1. minimal peri-lesional edema

 (mcq) About Glioblastoma multiforms what is true:
- The least common tumor in the brain.
- minimal peri-lesional edema.
- associated with neurofibromatosis type 1 (TRUE).
- It involves mostly the gray matter.
- no contrast enhancement of tumor.