. For questions 76 - 82 Abrain tumoroccurs when abnormal cells form within the brain. There are two main types of tumors: malignant or cancerous tumors and benigntumors.Cancerous tumors can be divided into primary tumorsthat start within the brain metastasis, and secondarytumors that have spread from somewhere else, known as brain metastatumors.All types of brain tumors may produce symptoms that vary depending on the part of the brain involved.These symptoms may include headaches, seizures, problem with vision, vomitting, and mental changes.The headache is classically worse in the morning and goes away with vomiting.More specific problems may include difficulty in walking, speaking, and with sensation.As the disease progresses unconsciousesnessmay occur. The cause of most brain tumors is unknown. Uncommon risk factorsinclude inherited neurofibromatosis, exposure to vinyl chloride, Epstein-Barr virus, and ionizing radiation.The evidence for mobile phonesis not clear.The most common types of primary tumors in adults are meningiomas (usually benign), and astrocytomassuch as glioblastomas.In children, the most common type is a malignant medulloblastoma.Diagnosis is usually by medical examination along with computed tomography or magnetic resonance imaging.This is then often confirmed by a biopsy.Based on the findings, the tumors are divided into different grades of severity. Treatment may include some combination of surgery, radiation therapy, and chemotherapy surgery, radiation therapy, and chemotherapy. Anticonvulsantmedication may be needed if seizures occur. Dexamethasoneand forusemidemay be used to decrease swelling around the tumor.Some tumors grow gradually, requiring only monitoring and possibly needing no further intervention.Treatments that use a person's immune systemare being studied.Outcome varies considerably depending on the type of tumor and how far it has spread at diagnosis. Glioblastomas usually have poor outcomes while meningiomas usually have good outcomes.The average five-year survival ratefor brain cancer in the United States is 33%. Secondary or metastaticbrain tumors are more common than primary brain tumors,with about half of metastases coming from lung cancer.Primary brain tumors occur in around 250,000 people a year globally, making up less than 2% of cancers.In children younger than 15, brain tumors are second only to acute lmphoblastic leukemiaas the most common form of cancer. In Australia the average lifetime economic cost of a case of brain cancer is $1.9 million, the greatest of any type of cancer. Source : https://en.wikipedia.org According the text above, these are the uncommon factors of brain tumor, except ….

.For questions 76 - 82

A brain tumor occurs when abnormal cells form within the brain. There are two main types of tumors: malignant or cancerous tumors and benign tumors. Cancerous tumors can be divided into primary tumors that start within the brain metastasis, and secondary tumors that have spread from somewhere else, known as brain metastatumors. All types of brain tumors may produce symptoms that vary depending on the part of the brain involved. These symptoms may include headaches, seizures, problem with vision, vomitting , and mental changes. The headache is classically worse in the morning and goes away with vomiting. More specific problems may include difficulty in walking, speaking, and with sensation. As the disease progresses unconsciousesness may occur.

The cause of most brain tumors is unknown. Uncommon risk factors include inherited neurofibromatosis, exposure to vinyl chloride, Epstein-Barr virus, and ionizing radiation. The evidence for mobile phones is not clear. The most common types of primary tumors in adults are meningiomas (usually benign), and astrocytomas such as glioblastomas. In children, the most common type is a malignant medulloblastoma. Diagnosis is usually by medical examination along with computed tomography or magnetic resonance imaging. This is then often confirmed by a biopsy. Based on the findings, the tumors are divided into different grades of severity.

Treatment may include some combination of surgery, radiation therapy, and chemotherapy surgery, radiation therapy, and chemotherapy. Anticonvulsant medication may be needed if seizures occur. Dexamethasone and forusemide may be used to decrease swelling around the tumor. Some tumors grow gradually, requiring only monitoring and possibly needing no further intervention. Treatments that use a person's immune system are being studied. Outcome varies considerably depending on the type of tumor and how far it has spread at diagnosis. Glioblastomas usually have poor outcomes while meningiomas usually have good outcomes. The average five-year survival rate for brain cancer in the United States is 33%.

Secondary or metastatic brain tumors are more common than primary brain tumors, with about half of metastases coming from lung cancer. Primary brain tumors occur in around 250,000 people a year globally, making up less than 2% of cancers. In children younger than 15, brain tumors are second only to acute lmphoblastic leukemia as the most common form of cancer. In Australia the average lifetime economic cost of a case of brain cancer is $1.9 million, the greatest of any type of cancer.

 Source   : https://en.wikipedia.org

According the text above, these are the uncommon factors of brain tumor, except….