Ependymomaにおける腫瘍血管の電子顕微鏡的考察

Electron Microscopic Observations of Blood Vessels in Ependymoma

I．はじめに

　脳腫瘍血管の微細構造に関する報告は，今日まで数多くなされている^{3,7,8,14-17,19,20）}．しかし，著者の調べた限り，Ependymomaの腫瘍血管だけを特別に取り上げて記載した報告は見あたらない．一般に，他のGliomaの一部として簡略に触れられているのにすぎない^15,17,19）．本論文では，Ependymomaの腫瘍血管およびその周囲構造の微細構造について報告する．

The findings of an ultrastructural study of the blood vessels and their surrounding structures in ependymoma are demonstrated. Six surgically removed cases of ependymoma are investigated. The lumen of the blood vessels, especially in vascular rosettes is often wider than those of normal brain capillaries. The endothelial cells are structurally varied, but sometimes attenuated in many areas. Also, they often have several fenestrations. Moreover, they have increased pinocytotic vesicles and filaments, and contain occasional Weibel-Palade bodies, multivesicular bodies and other cytoplasmic organelles.