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Example T1Gd and T2 MR images from noncystic and cystic GBM patients. (A) Noncystic GBM. Note the non-uniform central hypointense region on T1Gd (left) that does not show hyperintensity on T2 (right). (B) Cystic GBM. Cysts are identifiable by their round shape, thin contrast-enhancing rim on T1Gd, and their smooth homogenous appearance with clear borders on T2.
