Tumor is a uncontrolled and excessive division of cells. It is seen in many tissues of the body due to some or the other reasons. It is also found in the brain. They are called Brain Tumors or simply cancer.
Brain tumors are either benign or malignant. Benign tumors are the ones which are confined to the same organ or a tissue and don’t migrate. Malignant tumors are the ones which migrate from one part of the body to the other through the medium of blood, lymph, bone or they spread directly through the tissues.
Benign Brain Tumors:
There are no cancer cells in the benign brain tumor. They can be easily removed which doesn’t grow back once removed. The tissues lying adjacent to the tumor are not invaded by the tumor cells. They also do not spread to the other part of the body, but they can exert pressure on the other sensitive brain tissue causing serious complications and can therefore be dangerous. The benign tumors can sometimes transform into malignant ones.
Malignant Brain Tumors:
They have cancerous cells present in them. They are more severe than the benign tumors. They grow very quickly and spread to the neighboring tissues easily. Sometimes the cancer cells separate themselves from the brain tissue and spread to other parts of the brain or to the spinal cord or sometimes to the other body parts. This spreading of the cancerous cells to the other body cells is called metastasis.
Primary and Secondary Brain Tumors:
Primary tumors are the tumors that originate in the tissues of the brain. The secondary tumors are the tumors that originate from other parts of the body thus the tumors which arise in the brain and the ones which arise in some other parts of the body differ from each other.
Types of the Primary Brain Tumors:
The tumors in the brain which originate from the glial cells are called gliomas. They are the most common types of such tumors in the brain. There are five types of gliomas:
- · Brain Stem Glioma
- · Astrocytoma: These tumors arise from the astrocytes. They affect the major part of the brain.
- · Oligodendroglioma: They arise from the fatty tissues that surround the nerves to protect them. It is a rare kind of tumor.
- · Ependymoma
- · Mixed Glioma
Some other types of brain tumors that arise from cells other than the glial cells are:
- · Meningioma: The tumors arises from the meninges which is a mambrane that covers the brain. It is benign and slow growing.
- · Medulloblastoma: It is present in the neuroectoderm, in the cerebellum and arise from the abnormal cells that arise from some abnormal cells that are present in the early life.
- · Craniopharyngioma: It grows near the pituitary gland, which is located at the base of the brain. It doesn’t spread much but the growth affects the adjascent organs.
- · Schwannoma: They develop from schwann cells. It is also known as acoustic neuroma which usually affects adults.
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