title: [MRI features of 13 cases of intracranial ependymoma].
abstract: OBJECTIVE
  To improve the accuracy of qualitative diagnosis of intracranial ependymomas by analyzing their magnetic resonance (MR) images.
  
  
  METHODS
  The MR images of 13 cases of intracranial ependymomas confirmed by pathological examinations were investigated retrospectively.
  
  
  RESULTS
  In the 10 cases of ventricle ependymomas, the tumors were identified in the fourth ventricle in 3 cases and in the lateral ventricle in 7 cases. The T(1)-weighted MR images presented isointense or hypointense signals and T(2)-weighted images showed inhomogeneous hyperintense ones. No edema occurred around these tumors, and the contrast-enhanced scans presented inhomogeneous enhancement. In the other 3 cases of ependymomas in the brain parenchyma, including 2 cases of supratentorial and 1 subtentorial ependymomas. The tumor parenchyma presented hypointense signals in T(1)-weighted MR images as compared to the signals of the brain parenchyma, and in T(2)-weighted images, the signals intensities were similar to or higher than those of the gray matter. Mild edema could be seen around the tumors. Enhanced scans of the tumor parenchyma showed mild to moderate enhancement.
  
  
  CONCLUSIONS
  MR examination may help in the preoperative detection of intracranial ependymomas.
authors: Diagnostic Imaging Center, Nanfang Hospital, First Military Medical University, Guangzhou, 510515. qsj@fimmu.com
authors: Shi-jun
authors: SJ
authors: Qiu
authors: Xue-lin
authors: XL
authors: Zhang
mesh_terms: D000293:Adolescent; D000328:Adult; D001932:Brain Neoplasms / Q000175:diagnosis / Q000473:pathology*; D002648:Child; D004806:Ependymoma / Q000175:diagnosis / Q000473:pathology*; D005260:Female; D006801:Humans; D008297:Male