Brain Tumours - Meningioma Meningioma is the most common type of brain tumour in Singapore, and occurs mostly in those aged 40 to 60. Meningiomas grow on the protective tissue covering the brain and spinal cord, called the meninges. [Please download the PDF file if you are unable to view the image below.] Content serves as a guide only. Seek the advice of your doctor for more details Information correct as of March 2020 Reproduced with permission from the National Neuroscience Institute (NNI)