title: [Evaluation of tumor vessel of cerebral meningiomas with MR perfusion weighted imaging].
abstract: OBJECTIVE
  To evaluate the potential roles of MR perfusion weighted imaging (PWI) in preoperative assessment of vascularity of meningiomas.
  
  
  METHODS
  9 patients with meningiomas underwent conventional MR and PWI before operation (Grade I 32 cases, Grade II+III 7 cases). Immunohistochemical stain methods were used to quantitatively measure the microvessel density (MVD) values in meningiomas after operation. The pulse sequence of PWI was single shot GRE-EPI-T2*WI, the cerebral blood volume (CBV) maps were calculated from the original data of perfusion images and the maximum CBV values of meningiomas was acquired from CBV maps through measurement on the region of interest (ROI). The mean maximal relative cerebral blood volume (rCBV) values were calculated by dividing the maximum CBV of a tumor by that of the contralateral white matter. The differences of the mean maximal rCBV values between benign and malignant groups were analysed and commpared with the MVD values.
  
  
  RESULTS
  The mean maximal rCBV values of benign and malignant groups were 9.76±4.68 and 3.57±0.27, respectively. The MVD values of benign and malignant groups were 22±12 and 11±5, respectively. The difference in mean maximal rCBV values between the two groups was statistically significant (t=7.166, P<0.01). Correlation analysis demonstrated that the mean maximal rCBV values and MVD values had significantly positive correlation (r=0.715, P<0.01).
  
  
  CONCLUSIONS
  The mean maximal rCBV values are feasible for evaluation of microvessel angiogenesis of meningiomas in vivo and useful for predicting tumor grade.
authors.affiliation: Department of Radiology, Chaoyang Hospital, Capital Medical University, Beijing 100020, China.
authors.forename: Ruihua
authors.initials: R
authors.lastname: Shi
authors.affiliation: Department of Radiology, Chaoyang Hospital, Capital Medical University, Beijing 100020, China; Email: jiangt8166@hotmail.com.
authors.forename: Tao
authors.initials: T
authors.lastname: Jiang
mesh_terms: D001921:Brain; D001932:Brain Neoplasms; D002560:Cerebrovascular Circulation; D006801:Humans; D008279:Magnetic Resonance Imaging; D008577:Meningeal Neoplasms; D008579:Meningioma; D010477:Perfusion; D055420:Perfusion Imaging; D019043:Vascular Neoplasms