Final answer:
The nurse is reviewing the diagnostic results of a patient with a suspected brain tumor, the type tumor indicates it is malignant is 3) Glioblastoma.
Step-by-step explanation:
Glioblastoma is an aggressive and fast-growing tumor that arises from astrocytes, a type of glial cell in the brain. It is considered malignant because it infiltrates nearby tissues and has a high tendency to recur even after treatment. Astrocytoma and Meningioma are also types of brain tumors, but they are generally considered less aggressive and have a lower likelihood of being malignant.
Astrocytomas are tumors that originate from astrocytes, while meningiomas develop in the brain's protective coverings called meninges. Pituitary adenoma, on the other hand, is a non-malignant tumor that originates in the pituitary gland, a small pea-sized gland located at the base of the brain. So therefore the correct answer is 3) Glioblastoma