Carcinoma cell, coloured transmission electron micrograph (TEM) showing the metaphase stage of mitosis. A carcinoma is any malignant cancer that arises from epithelial cells. These cells have the typical morphology of cancer cells. The nucleus is enlarged and multilobed, the cell walls are covered in small projections (SEM) and the cytoplasm contains a large number of organelles. Magnification: x5000 when printed at 10 centimetres wide.