[The Role of Imaging in Central XXXX ].

@entity4767 @entity281 @entity6220 @entity2287
@entity281 invade the central nervous system. Magnetic resonance imaging (MRI) is the main tool that is used to evaluate @entity6220 . The useful sequences on MRI are dependent on the locations, such as intra-axial, extra-axial, and spinal cord. For intra-axial lesions, besides the fundamental sequences, including T1-weighted images, T2-weighted images, and fluid-attenuated inversion recovery (FLAIR) images, advanced sequences, such as diffusion-weighted imaging, diffusion tensor imaging, susceptibility-weighted imaging, and MR spectroscopy, can be applied. They are occasionally used as determinants for quick and correct diagnosis. For extra-axial lesions, understanding the differences among 2D-conventional T1-weighted images, 2D-fat-saturated T1-weighted images, 3D-Spin echo sequences, and 3D-Gradient echo sequence after the administration of @entity2287 is required to avoid wrong interpretations. FLAIR plus @entity2287 is a useful tool for revealing abnormal enhancement on the brain surface. For the spinal cord, the sequences are limited. Evaluating the distribution and time course of the spinal cord are essential for correct diagnoses. We summarize the role of @entity4767 and show the pitfalls, key points, and latest information in them on clinical practices.
