FIG 6. Coronal view images of a 45-year-old woman with lymphoma in the splenium of the corpus callosum.

A, Spin-echo T2-weighted image shows white matter edema around the lateral ventricles. The corpus callosum cannot be clearly recognized.

B, Superposed color image. The corpus callosum is clearly identified as a green structure (arrow). The white matter lateral to the left lateral ventricle appears to have at least three layers: medial to lateral, red (tapetum, arrowhead), blue (internal and external sagittal strata, open arrow), and red layers. The asymmetrically widened tapetum on the left indicates extension of peritumoral edema in this region.