Brain tumor Symptoms

Headache is probably the most common symptom of a brain tumor. It should be strongly emphasized, however, that most headaches do not represent an underlying brain tumor. Headaches caused by brain tumors may vary depending on the location

Seizures are another symptom that occur in 15% to 95% of patients, depending on the location of the brain tumor. Brain tumors are more likely to be localized and affect one area of the brain. In such cases they can cause partial seizures. In this case, a person does not lose consciousness but may experience confusion, jerking movements, tingling, or odd mental or emotional events. Generalized seizures, which can cause loss of consciousness, are less common because they are caused by disturbances of nerve cells in diffuse areas of the brain.

Gastrointestinal symptoms, including nausea, are also common. Nausea and vomiting, in fact, often occur in children with brain tumors and in all people with brain stem cell tumors.

Sometimes the only symptoms are mental changes, which may include Memory loss, impaired concentration, problems with speech and reasoning, increased sleep. Other important symptoms include the following:
Gradual loss of movement or sensation in an arm or leg.
Unsteadiness.
Unexpected visual disturbance (especially if it is associated with headache), including vision loss (usually of peripheral vision) in one or both eyes, or double vision.

Specific symptom syndromes may help identify the tumor. The following are some examples.
Symptoms of Brain Stem Gliomas. Sudden onset of symptoms that include vomiting (usually just after waking), a clumsy walk, muscle weakness on one side of the face, difficulty in swallowing, slurred or nasal speech, as well as impaired hearing or vision.
Symptoms of Glioblastoma Multiforme. Rapid onset and worsening of symptoms that include headaches, seizures, memory loss, and changes in behavior.

Symptoms of brain tumors that indicate an emergency condition requiring prompt intervention include the following:

Types of brain tumors

Astrocytoma

These tumors arise from star-shaped cells called astrocytes that normally serve as supportive tissue for brain cells. These tumors may behave with different degrees of malignancy or invasiveness that may be described as low-grade, mid-grade or high-grade, or, alternatively as grade I to grade IV. The most life threatening type of astrocytoma is grade IV and is also known as glioblastoma multiforme. Astrocytomas may occur in several different parts of the brain, such as the cerebral hemispheres containing the frontal, parietal, temporal and occipital lobes, in the brainstem when it is called a
brainstem glioma, or in part of the visual pathway when it is called an optic nerve glioma.

CNS Lymphoma
CNS lymphoma may affect previously healthy individuals or patients who have compromised immune systems. These tumors are treatable with radiation.

Ependymoma
This tumor type arises from cells that usually form the lining of the fluid-filled cavities of the brain. Ependymomas may occasionally spread to another location in the central nervous system or originate in the spinal cord.

Glioblastoma Multiforme (GBM)
This malignant brain tumor is the most common primary brain tumor that occurs in adults. Its insidious biological behavior makes the treatment of this tumor type extremely difficult.

Medulloblastoma
Medulloblastomas are the second most common type of brain tumor in children but may also occur in adults. These tumors are located in the cerebellum and may cause symptoms of clumsiness, headaches and nausea.

Metastatic Brain Tumors
Metastatic brain tumors occur more frequently than primary brain tumors. These malignant brain tumors are formed by cancer cells that originated from a cancer growing in a separate organ of the body before spreading to the brain. The malignant tumors that spread most often to the brain are lung cancer, breast cancer, skin melanoma, and renal (kidney) cancer. Metastatic brain tumors may be single or multiple and can occur in the cerebral hemispheres or cerebellum.

Treatment of brain tumors

The currently available treatment options for malignant brain tumors include surgery, radiosurgery, chemotherapy, radiation therapy and immunotherapy, which may be employed in different combinations depending on the type of malignant brain tumor, stage of disease and overall health.

Surgery
This is the treatment of choice for accessible brain tumors, which are located in areas of the brain that may be removed without great potential of neurological damage. The goals of surgery are: 1) to remove as much of the tumor as possible so there will be less of a tumor burden for adjuvant therapies, 2) to provide tumor tissue for microscopic examination in order to reach an exact diagnosis in order to guide additional treatment, and 3) to provide direct access to the malignant tumor cells for other treatments, such as implants for gene therapy. If surgical removal is not immediately feasible or if the tumor is inaccessible, that is, in an area of the brain that is deep and inoperable, then a stereotaxic biopsy may be performed to establish a diagnosis. This is a minimally invasive procedure whereby computer guidance allows a probe to reach almost any area of the brain through a small hole in the skull.

Radiosurgery
Many tumors consist of cells that die after exposure to radiation. Radiosurgery utilizes a single, high dose of radiation delivered to a discrete, well-defined area.

Radiation Therapy
Conventional radiation therapy employs external beams of x-rays or gamma rays produced by a machine called a linear accelerator or a cobalt machine aimed at the tumor or when necessary, the entire brain. Radiation therapy may be given over a period of several weeks.

Chemotherapy
Chemotherapy utilizes drugs to poison and kill malignant tumor cells. There are many drugs that can destroy brain tumor cells, but each particular tumor may consist of cells with different drug sensitivities. Therefore, chemotherapy is usually administered as a combination of drugs in order to maximize the damage to the malignant tumor cells and minimize the overall toxicity to the body. Chemotherapy drugs may be administered into the veins of the body, that is intravenously, taken in pill form by mouth, or delivered directly into the central nervous system by means of implanted drug reservoirs and pumps, or drug-saturated wafers placed into the brain after the tumor has been surgically removed.

Immunotherapy
The body's natural defense system against disease is the immune system. Immunotherapy recruits the body's natural disease-fighting mechanisms to mount an attack against malignant brain tumor cells. The agents of immunotherapy are called biological response modifiers, which are substances that either suppress tumor cells directly or stimulate the body to produce anti tumor factors.

Experimental Therapy
Despite treatment with conventional therapies such as surgery, radiation and chemotherapy, malignant brain tumors nearly always recur. As a result, a number of experimental therapies have been devised to treat malignant brain tumors after they have grown back. The experimental therapies that are currently available include gene therapy, experimental chemotherapy, chemotherapeutic drugs delivered by implantable wafers (Gliadel wafers), and infusion of immunotoxins directly into the brain tumor. These treatments are continuously undergoing analysis and revisions to assure their safety and efficacy. New treatments undergoing laboratory development and testing will be available in the near future.