MEHAU KULYK / SCIENCE PHOTO LIBRARY MEHAU KULYK / SCIENCE PHOTO LIBRARY
Coloured computed tomography (CT) brain scan showing a large, intracranial tumour, the large round mass (yellow) seen at centre. Within the tumour, spots indicate fluid-filled cysts. The outer border of the tumour (pink) has become calcified with age. This tumour is most probably a low-grade glioma, a tumour of the supporting glial cells, the specialised connective tissue of the brain and central nervous system. Gliomas include the astrocytomas and glioblastomas and account for the majority of intracranial tumours. Slow-growing, low-grade (less malignant) gliomas may exist for years before rapidly acquiring a malignant character.
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