Figure 7.

Imaging appearances of a glioblastoma following treatment with bevacizumab. Axial diffusion weighted image (A) through the level of centrum semiovale demonstrates a confluent area of high signal (arrowheads) surrounding the cystic resection cavity associated with low values (arrowheads) on the corresponding ADC map suggestive of diffusion restriction developed after treatment with bevacizumab. The precontrast axial T1-weighted image (C) at the same level demonstrates irregular T1 hyperintensities. Enhancement, if any, is hard to appreciate on the post contrast T1 weighted image (D) at the same level, demonstrating the importance of the delta T1 map (not shown).