ISM / SCIENCE PHOTO LIBRARY ISM / SCIENCE PHOTO LIBRARY
Light micrograph of a section through a pheochromocytoma tumour of the adrenal gland. At centre and left, large tumour cells are seen in the medulla, compared to the smaller cells of the cortex (at upper right). Although this tumour is usually benign (non-cancerous), it can lead to uncontrolled over secretion of adrenal hormones such as adrenaline. HES stain. Magnification: x550 when printed at 10 centimetres wide.
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