Final answer:
The term for a brain tissue tumor is 'glioma,' derived from the Greek word 'enkephalon' for brain, and it has implications for treatment due to its location in the sensitive central nervous system.
Step-by-step explanation:
The term for a tumor composed of brain tissue using the suffix -oma is glioma. This term originates from the Greek root word enkephalon, which means “brain.” A glioma can occur in the brain, which is the large organ of the central nervous system comprised of white and gray matter. If the glioma grows within the brain, it could necessitate medical intervention such as surgery, but sometimes, gliomas can't be removed without risking further damage to the central nervous system. Treatments can vary depending on the specific type and location of the tumor within the brain.