GBM in a 49-year-old man. A, Axial T2-weighted image demonstrates a large right heterogeneous hemorrhagic mass with areas of necrosis (black arrow). B, Axial susceptibility gradient echo image demonstrates variable low signal intensity within the tumor, which confirms the presence of the blood products (white arrow) C, Axial enhanced Tl-weighted image. Note second right frontal lobe-enhancing lesion representing multifocal involvement (open arrow). (Click to magnify figure)

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