GCA / SCIENCE PHOTO LIBRARY GCA / SCIENCE PHOTO LIBRARY
Brain tumour. Coloured magnetic resonance imaging (MRI) scan of a large pituitary adenoma (blue) extending around the side of the brain. This scan shows a horizontal slice through the brain. Normal brain tissue (green) has been squeezed to the right. Pituitary adenomas are benign tumours that arise in the hormone-secreting pituitary gland. They typically cause over-production of pituitary hormones, leading to disorders such as gigantism, acromegaly (abnormal enlargement of skull, hands and feet) and Cushing's syndrome. Treatment includes surgical removal of the tumour, radiotherapy and hormone replacement therapy, to restore normal levels of pituitary hormones.
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