Ependymoma is a WHO Grade II tumor with generally low Ki67 labeling index. This case showed staining of up to 5% of nuclei in some foci, other areas were completely negative. Courtesy of: Dr. Luciano de Souza Queiroz, Dept. of Pathology, Faculty of Medical Sciences, State University of Campinas (UNICAMP), Campinas, São Paulo State, BRAZIL. Additional images are here.