ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Schwannoma nerve sheath tumour. Coloured magnetic resonance imaging (MRI) scan of a section through the left calf of a 60-year-old patient, showing a schwannoma tumour (white, centre). Schwannomas are benign (non-cancerous) tumours arising from schwann cells that form the myelin sheaths surrounding nerves.
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