Epithelial tumors are the most common group of tumor processes. The frequency of epithelial tumors is due to the regeneration process of epithelial tissue, due to which rapidly proliferating epithelial cells are more sensitive to carcinogenic effects and can easily be transformed into a tumor. The epithelial tissue has some structural features that are preserved in the tumor itself, which facilitates the identification of the epithelial origin of the neoplasm. The most important of these structural features of epithelial tumors are described below.

Epithelial cells are located close to each other and are associated with dense intracellular contacts of the so-called des #. They do not have an intracellular substance and in contact with the capillary network. This adhesion of cells to each other forms or attracts large masses of cells of the same type and has no other intracellular structures. The formation of large or small cell clusters in the form of nests or subsoil is a very characteristic feature of epithelial origin, even when the tumor is extremely undifferentiated.

Epithelial cellular groups are surrounded by stroma connective tissue and blood vessels that perform support and power features. Consequently, the stromrom and parenchyma epithelial tumors differ sharply, and this is a very important marker to determine their histogenesis. The proliferation of epithelial cells stimulates the local growth of the connective tissue and the network of blood vessels. This manifestation is defined as a desphastic reaction of tumors and is expressed differently in separate tumors and different sections of the same tumor.

Epithelial cells of the coating and ferrous epithelium are separated from the remaining tissues with a basal membrane film. This structural feature is also preserved in epithelial tumors, since it is not damaged with benign tumors, and with malignant tumors, it is destroyed by infiltrative growth of the parenchyma of the tumor.

Epithelial tumors are divided into benign and malignant epithelial tumors. The structural organization of the epithelium is crucial for macroscopic and histological manifestations of tumors. The surface of the slice of epithelial tumors is a grainy, since cluster epithelial cells in nests and hoods are highlighted against the background of the stroma of the connective tissue. This pattern is expressed in all tumors, but it is most pronounced in slowly growing benign epithelial tumors. Surface epithelium grows in the form of a papilloma, and the ironic epithelium forms adenoma. Best ukrainian dating site https://sweetydate.com with free chat.