BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY
Choriocarcinoma. Light micrograph of a section through tissue from the uterus, in a case of a choriocarcinoma. This is a malignant (cancerous) tumour of trophoblast cells of the placenta. Trophoblast cells form part of the chorion, the membrane that surrounds a developing embryo. The chorion connects to maternal tissue to form the placenta. Choriocarcinoma may occur when an embryo fails to develop, but the placental tissue continues to proliferate.
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