Angioedema is a rare malignant tumor originating from the endothelium of blood (hemangioendothelioma) or lymph (lymphangiectasia) vessels. Occurs in the skin, kidneys, endocrine glands, mammary gland, liver, bones. Angioedema are single, less often multiple. Tumor node round, thick consistency, dark red or white depending on whether any of the vessels (vascular or lymphatic) proceeds tumor. In the context of homogeneous or porous mass. The parenchyma angioedema are atypical endothelial cells (polygonal, cylindrical, spindle-shaped) with pale or hyperchromic cores round or oval; meet multinucleated cells and numerous mitoses (Fig). Atypical endothelium, set on thin argyrophylla frame, sometimes in several layers, multiple forms Anastasiya atypical vascular tubes. In the lumen of the part of the vessel contains blood (hemangioendothelioma) or lymph (lymphangiectasia). In other cases, angioedema has a solid structure, as proliferating cells endothelial fill all the lumen of the vessels. The shape of the vessels are revealed only at colouring reticular fibers. These forms of angioedema difficult to distinguish from cancer. In some cases, the tumor is composed of cells sarcomatosis nature, originating from the outer layers of vascular walls; vascular wall disappear into the tumor weight, saved only their gleams. Such tumors are called angiosarcoma. A. an extremely malignant and metastasize primarily in the lungs. The children are not metastasize, however, have infiltrating growth. Treatment and surgery followed by radiotherapy. Cm. also Angioma, Hemangioma.

Angioedema. Vessels and lining their atypical epithelium. Gleams part vessels savchina (X 210).