Abstract
A case of multiple angiolipoma appearing on both forearms, the left upper arm and the left side of the neck of a 75-year-old man was reported, together with the electron microscopic findings of its angiomatous components. Electronmicroscopically the angiomatous components of the tumor were composed of endothelial cells, pericytes, fibroblast-like cells and more undifferetiated cells. Transitional cells from those cells were also observed. From these findings and light microscopic findings it was suggested that the vascular tissue of angiolipoma was similar to those of the angioblastoma, in a narrow sense, as described by Kitamura. The PAS positive thrombi within the vascular portion which were frequently observed in angiolipoma showed partially characteristic crossbandings with an axial repeat distance of about 200Å by electron microscopic examination and were identified with fibrin.
