400981 Lecture Notes - Lecture 31: Magnetic Resonance Imaging, Tuberous Sclerosis, Ionizing Radiation
26 Feb 2020
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Document Summary
A brain tumour occurs when abnormal cells form within the brain. There are two main types of tumours: cancerous (malignant) tumours and benign (non-cancerous) tumours. Cancerous tumours can be divided into primary tumours, which start within the brain, and secondary tumours, which have spread from elsewhere, known as brain metastasis tumours. All types of brain tumours may produce symptoms that vary depending on the part of the brain involved. These symptoms may include headaches, seizures, problems with vision, vomitting and mental changes. The headache is classically worse in the morning and goes away with vomiting. Other symptoms may include difficulty walking, speaking or with sensations. The cause of most brain tumours is unknown. Uncommon risk factors include exposure to vinyl chloride, epstein-barr virus, ionising radiation , and inherited syndromes such as neurofibromatosis, and tuberous sclerosis. Studies on mobile phone exposures have not shown a clear risk.
