List of abbreviations:
PNET: Primitive Neuroectodermal Tumor
pPNET: peripheral Primitive Neuroectodermal Tumor
cPNET: central Primitive Neuroectodermal Tumor
E/S: Ewing Sarcoma
IHC: Immunohistochemistry
CT scan: Computed Tomography scan
MRI: Magnetic resonance imaging
FISH: Fluorescent In Situ Hybridization