Fig. 7

Coronal post-contrast T1WI demonstrates a metastasis (a, dotted circle) to the left caudate nucleus from breast cancer, treated with 27 Gy in 3 fractions of SRS at an external institution. Fifteen months after SRS (b), new extensive enhancement developed in the corpus callosum (arrowheads). Again note the absence of enhancement along the ventricular surface. At 2 years post-SRS (c), the callosal component has receded, but new enhancement (arrow) has development lateral to the treated lesion. This also subsequently receded without specific treatment, consistent with RN