Fig 3. A, Postcontrast T1-weighted (TR/TE, 3218/5.71 ms) axial image in a 55-year-old man with glioblastoma multiforme showing a heterogeneously enhancing mass with irregular central necrosis in the right peritrigonal region. B, Base image from the perfusion CT study showing the tumor in the right peritrigonal region. C, Perfusion CT PS maps (C) showing very high permeability (PS = 5.14 mL/100 g per minute) along the enhancing nodular margins of the tumor and CBV maps (D) showing high blood volume (CBV = 3.49 mL/100 g) within the enhancing periphery of the tumor.