ISM / SCIENCE PHOTO LIBRARY ISM / SCIENCE PHOTO LIBRARY
Light micrograph of a section through a pheochromocytoma tumour of the adrenal gland. At left in the medulla of the gland, large eosinophilic tumour cells are seen arranged in cords or small masses marked by synaptophysin (chromogranin A, blue); at upper right the normal adrenal cortex is seen. Although this tumour is usually benign (non-cancerous), it can lead to uncontrolled over secretion of adrenal hormones such as adrenaline. Magnification: x550 when printed at 10 centimetres wide.
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