They can be low-grade or high-grade tumors.

Generally, there is a good prognosis for low-grade tumors, and a poor prognosis for high-grade tumors.

MPE is a localized and slowly growing, low-grade tumor.

Since some high-grade lesions arise from low-grade tumors, these trends are worth mentioning.

It is non-aggressive when compared to other oral cavity tumors, i.e. it is a low-grade tumor.

High-grade tumors usually grow and spread more quickly than low-grade tumors.

Characteristically low-grade tumor's are resistant to systemic chemotherapy and curative-intent surgical resection of the tumor should be considered.

Nausea is seen in almost all cases of astroblastoma, especially in low-grade tumors.

Focal, tectal, and exophytic cervicomedullary tumors are generally low-grade tumors.

For low-grade tumors, the prognosis is somewhat more optimistic.