Fig. 4

MR images at 7 months after the first surgery showing occurrence of a large tumor at the paravermian region of the left cerebellum. The tumor was enhanced in a ring-like fashion by Gd and accompanied by marked peritumoral brain edema. Axial T2-weighted (a), T1-weighted (b), and Gd-enhanced T1-weighted (c) MR images. MR images disclosing no tumor growth of the left insular tumor and hydrocephalus. Axial T2-weighted (d) and Gd-enhanced T1-weighted (e) MR images