DR. E. WALKER / SCIENCE PHOTO LIBRARY DR. E. WALKER / SCIENCE PHOTO LIBRARY
Cervical cancer. Light micrograph of a section through a carcinoma in situ in the epithelium of a woman's cervix. In a normal cervix, cell division in the epithelium is confined to the basement mem- brane, with cells above becoming flat towards the top. In this cervix the upper layer is full of ac- tively dividing cancer cells with oversized, dark- staining nuclei. Mitosis (nuclear division) is seen in some cells, their nuclei appearing black. This tumour is classed as cervical intraepithelial neoplasia grade III, as the cells have not invaded the tissue below. Such tumours are destroyed by excision or laser burning. Stained with eosin and hematoxylin. Magnification x125 at 35mm size.
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