Fig. 5

Illustration of sphere type of right acoustic tumor subjected to tumor resection due to no-hearing associated symptom (a) T1 weighted MRI imaging with contrast administration at time of GK (b) T2 weighted MRI imaging at time of GK (c)T1 weighted MRI imaging with contrast administration 3 years after GK (d) T2 weighted MRI imaging 3 years after GK (e)T1 weighted MRI imaging with contrast administration 4 years after GK (f) T2 weighted MRI imaging 4 years after GK (g)T1 weighted MRI imaging with contrast administration 6 years after GK (h) T2 weighted MRI imaging 6 years after GK (i) H& E staining in central part of tumor scattered with hemorrhage (×40) (j) H&E staining in peripheral part of tumor(×100) (k) Immunohistochemistry staining of S100 of tumor(×100) (l) Immunohistochemistry staining of EMA(×100). Back arrow indicated the time point of craniotomy for tumor removal. White arrow indicated the peri-tumor arachnoid cyst