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FIGURE 179-1

FIGURE 179-2

FIGURE 179-3

FIGURE 179-4

FINDINGS Figure 179-1. Sagittal T1WI through the corpus callosum (CC). There is a mixed cystic anteriorly (cerebrospinal fluid [CSF] intensity) and solid hypointense (posteriorly) mass in the midbody of the CC (arrow) projecting to the septum pellucidum inferiorly. Post-contrast T1WI (not shown) demonstrated very minimal contrast enhancement. Figure 179-2. Axial FLAIR through the corona radiata. The solid components are hyperintense and project into the right corona radiata (arrow), while the cystic components show CSF hypointensity. Figure 179-3. Axial T2WI through the corona radiata. The solid components are somewhat hyperintense but brighter than surrounding white matter (WM). Figure 179-4. Axial DTI color directional map through the CC. There is disruption of the red CC fibers (vertical arrows) and the adjacent right superior fronto-occipital fasciculus and the superior internal capsule (transverse arrows).

DIFFERENTIAL DIAGNOSIS Glioblastoma (GB), lymphoma, tumefactive or toxic demyelination, oligodendroglioma.

DIAGNOSIS CC oligodendroglioma II (ODG II) recurrent.

DISCUSSION

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