Fig 2. Treatment response of the patient shown by MR imaging. Imaging was performed before treatment (A–C) and 10 days (D–F) and 3 months (G–I) after therapy. A–C, A small cystic right frontal lesion without contrast enhancement (A, B) or edema (white arrow, C) is seen; in the right perisylvian area, hypointense lesions medially (open triangle) and laterally to the right sylvian fissure are seen on fluid-attenuated inversion recovery (FLAIR) but not on T1-weighted images. D–F, Soon after therapy, ring enhancement (D, E) and edema (F) are detected in the right frontal lesion (white arrow); ring enhancement with severe edema is seen in the perisylvian lesions (open and white triangles; E, F). G–I, Three months after treatment, a slight enhancement (G, H) and edema (I) are still present frontally (white arrow); no lesion is seen in the perisylvian area (open and white triangles; H, I). A, D, G are T1-weighted images without contrast; B, E, H, T1-weighted images with contrast; and C, F, I, FLAIR images.