Neoplasms, Glandular and Epithelial [Disease/Finding] Neoplasms, Mesothelial [Disease/Finding] Neoplasms, Mesothelial 115232000 1025409 M0027535 Neoplasms composed of tissue of the mesothelium, the layer of flat cells, derived from the mesoderm, which lines the body cavity of the embryo. In the adult it forms the simple squamous epithelium which covers all true serous membranes (peritoneum, pericardium, pleura). The concept does not refer to neoplasms located in these organs. (From Dorland, 27th ed) N0000003765 Mesothelial Neoplasms C7708 C0206714 Neoplasms, Mesothelial D018301