1. Clinical correlation of uncinate fasciculus involvement on cross-sectional MR imaging.A, Nonenhanced parasagittal T1-weighted image in a 36-year-old woman with a temporal lobe astrocytoma extending into the frontal lobe.
Clinical correlation of uncinate fasciculus involvement on cross-sectional MR imaging.A, Nonenhanced parasagittal T1-weighted image in a 36-year-old woman with a temporal lobe astrocytoma extending into the frontal lobe. The region of the abnormal uncinate fasciculus (small arrows) can be identified within the low signal intensity of the tumor. It passes around the middle cerebral artery (arrowhead) into the frontal lobe, including the posterior orbital gyrus (large arrow). The relationship of the uncinate fasciculus to the middle cerebral artery is similar to that shown in the dissected specimen in Figure 2.B, T2-weighted coronal image in a 44-year-old man with a temporal lobe astrocytoma. The tumor and edema are located adjacent to the amygdala (A). The location of the uncinate fasciculus on the coronal MR study in Figure 3A suggests the tumor is spreading out of the temporal lobe into the extreme and external capsules (arrows) via the region of the uncinate fasciculus.C, T2-weighted axial image in a 42-year-old man with a temporal-lobe oligodendroglioma that is just beginning to spread into the extreme capsules (small arrows) via the region of the uncinate fasciculus at the level of the anterior commissure (large arrow).D, T2-weighted axial image in a 60-year-old man with an oligodendroglioma. The tumor (small arrows), shown at the level of the anterior commissure (large arrow), has spread into the extreme and external capsules on either side of the claustrum (arrowhead) with further involvement of the orbital gyri (crossed arrow). Comparison of the images in C and D with Figure 3C illustrates the spread of the tumor from temporal to frontal lobe via the uncinate fasciculus.
E. Leon Kier et al. AJNR Am J Neuroradiol 2004;25:
©2004 by American Society of Neuroradiology