Legend for Figure 1
Fig. 1. Illustrations of A. A pseudoprogression
resulting from radiation-induced inflamed necrosis. MR images taken
post-operatively show axial T2, FLAIR, T1 contrast-enhanced, and
perfusion, with enhancement in the right temporal lobe, areas of
T2/FLAIR hyperintensity in the surrounding parenchima, indicating a
lesion induced by radiation therapy. There is no increase in relative
cerebral blood volume in the enhancing portion of the lesion, which
further suggests pseudoprogression. B. A tumor relapse shown by
images taken from the same patient three months later. MR images taken
post-operatively show axial T2, FLAIR, T1 contrast-enhanced, and
perfusion, with heterogeneous enhancement in the right temporal lobe and
great extension of the T2/FLAIR hyperintensity area, indicating a
combination of tumor spread and vasogenic edema involving the right
peritrigonal and insular regions. There is increased relative cerebral
blood volume in the enhancing portion of the lesion, representing
tumoral progression.