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 Indian J Med Microbiol  
 

Figure 5 (A-F): Tract displacement: Pre-operative T2W axial image (A) shows a heterogeneous mass (astrocytoma) (arrow) in the right posterior frontal lobe, reaching the motor cortex posteriorly. 3D tractography image (B) superimposed on a 3D SPGR sequence shows posterior displacement of the corticospinal tract (arrow). The magnified FA image (C) and corresponding directionally encoded color map (D) show how the ROIs (seed) were placed in the region of the corticospinal tracts to obtain the 3D tractography image (B). These images helped the neurosurgeon in taking an anterior approach. Post-operative tractography images (E, F), superimposed on a 3D-SPGR sequence show relocation of the posteriorly displaced corticospinal fi bers (arrows), when compared with the pre-operative image (B). The patient had left-sided motor weakness, prior to surgery, which recovered a few days after surgery, as predicted by DTI

Figure 5 (A-F): Tract displacement: Pre-operative T2W axial image (A) shows a heterogeneous mass (astrocytoma) (arrow) in the right posterior frontal lobe, reaching the motor cortex posteriorly. 3D tractography image (B) superimposed on a 3D SPGR sequence shows posterior displacement of the corticospinal tract (arrow). The magnified FA image (C) and corresponding directionally encoded color map (D) show how the ROIs (seed) were placed in the region of the corticospinal tracts to obtain the 3D tractography image (B). These images helped the neurosurgeon in taking an anterior approach. Post-operative tractography images (E, F), superimposed on a 3D-SPGR sequence show relocation of the posteriorly displaced corticospinal fi bers (arrows), when compared with the pre-operative image (B). The patient had left-sided motor weakness, prior to surgery, which recovered a few days after surgery, as predicted by DTI