A brain tumour is a mass of abnormally growing cells in the brain or skull. Half of the time it will have spread from somewhere else in the body (metastatic brain tumour). But sometimes it can just start from the brain (primary tumour) the tumours are named from the tissue type where they originate from
Spinal disorders and the pain associated with them account for a significant portion of disability at work, with most complaints occurring in the lumbar region. Men are more frequently affected. It is essentially a disease of the middle aged, unless precipitated by trauma. L4/5 and L5/S1 disc account for 90% of the cases, with each level affected about equally. L3/4 disc accounts for the majority of the remaining herniations.