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Tumors of the Nervous System complete tutorial

Tumors of the nervous system can be classified into two broad categories: primary tumors, which originate in the nervous system, and secondary tumors, which originate elsewhere in the body and spread to the nervous system. Primary tumors of the nervous system can be further divided into benign (non-cancerous) and malignant (cancerous) tumors.
**Benign Tumors of the Nervous System:**
1. **Meningiomas**: These are the most common type of benign brain tumor. They arise from the meninges, the membranes that surround the brain and spinal cord.
2. **Schwannomas**: These tumors arise from Schwann cells, which produce the myelin sheath that surrounds and insulates nerve fibers.
3. **Neuromas**: These are benign tumors that arise from nerve tissue.
4. **Pituitary Adenomas**: These are benign tumors that arise from the pituitary gland, a small gland at the base of the brain that produces hormones.
5. **Craniopharyngiomas**: These are benign tumors that arise near the pituitary gland.
**Malignant Tumors of the Nervous System:**
1. **Gliomas**: These are the most common type of malignant brain tumor. They arise from glial cells, which support and nourish neurons.
2. **Astrocytomas**: These are a type of glioma that arises from astrocytes, a type of glial cell.
3. **Oligodendrogliomas**: These are a type of glioma that arises from oligodendrocytes, another type of glial cell.
4. **Ependymomas**: These are tumors that arise from ependymal cells, which line the ventricles of the brain and the central canal of the spinal cord.
5. **Medulloblastomas**: These are highly malignant tumors that arise in the cerebellum.
6. **Primitive Neuroectodermal Tumors (PNETs)**: These are highly malignant tumors that arise from primitive nerve cells.
7. **Germ Cell Tumors**: These are tumors that arise from germ cells, the cells that develop into sperm or eggs.
8. **Metastatic Tumors**: These are tumors that have spread to the nervous system from other parts of the body.
**Symptoms of Tumors of the Nervous System:**
The symptoms of a tumor of the nervous system depend on the location of the tumor. Common symptoms include:
1. **Headaches**: These are common and can be caused by increased intracranial pressure or irritation of pain-sensitive structures.
2. **Seizures**: These can occur if the tumor affects the brain's electrical activity.

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