DIPG and embryonal brain tumors

DIPG is regarded to be worst pediatric brain cancer, with 9 months average survival time, and considered as very aggressive cancer.

Embryonal tumors however, like ATRT and ETMR, have similar - or even shorter average survival time: medulloepithelioma - 5 months - and are to be considered more aggressive, than DIPG, because:
--- DIPG grows in confined space
--- and pons/medulla contain vital life centres, easily squeezed thus
while ETMR tumors often grow in non-confined brain space, like GBM, and to have even shorter survival time, they need to be way more aggressive.