Fig. 1.

Preoperative magnetic resonance (MR) images. A : Midsagittal T2-weighted fat-suppressed MR images show an isosignal intensity mass at T1-2. The spinal cord is displaced to the right posterior side. At the center of the tumor, there are low signal speckled dots. B and C : Mid-sagittal T1-weighted MR image (B) and gadolinium-enhanced fat-suppressed MR images (C) reveal isosignal intensity and a homogenous well-enhanced tumor. Speckled dots are observed at the center of the tumor. There is no dura tail sign. D : Axial MR image shows a well-circumscribed tumor displaced to the left side. It shows no extension to the foramen. E : Coronal MR image reveals that the tumor is located eccentrically in the intradural extramedullary and compresses the spinal cord.