Critical Care Registered Nurse (CCRN) Practice Exam

Which type of brain tumor is classified as WHO grade I and typically has a favorable outcome?

1. Glioblastoma multiforme

2. Schwannoma

3. Anaplastic oligodendroglioma

4. Pineoblastoma

The correct answer is: Schwannoma

Schwannoma is classified as a WHO grade I tumor and is known for its generally favorable prognosis. These tumors are typically slow-growing and benign, derived from Schwann cells, which are responsible for producing the myelin sheath that insulates nerve fibers. The slow growth allows for better surgical options, with many patients experiencing complete resection and excellent postoperative outcomes. In contrast, the other tumor types listed, such as glioblastoma multiforme, anaplastic oligodendroglioma, and pineoblastoma, are classified as higher-grade tumors (grade II and above), indicating a more aggressive behavior and poorer prognosis. Glioblastoma multiforme, for example, is known for its rapid progression and high mortality rate, while anaplastic oligodendroglioma and pineoblastoma are associated with more serious complications and require rigorous treatment protocols due to their malignant nature. This distinction in grade and behavior explains the favorable outcome associated with schwannomas compared to the other options.