Abstract: INTRODUCTION Gliomas are the most common primary brain tumors.Grading gliomas is of significant clinical importance because treatment plans vary between high-and low-grade gliomas.Histopathologic grades of gliomas are closely related to microvasculature.[1] Magnetic resonance (MR) perfusion-weighted imaging (PWI) is a technique to quantitatively evaluate tumor microenvironments by measuring cerebral blood volume (CBV).