Reticulin stain showing reticulin fibers surrounding individual tumor cells or small groups of cells in a hemangioblastoma. Other primary cerebellar or spinal intramedullary tumors usually don't contain such abundant reticulin. 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.