Polyploidy in atypical grade II choroid plexus papilloma of the posterior fossa - Brassesco, María Sol; Valera, Elvis Terci; Neder, Luciano; Castro-Gamero, Angel Mauricio; Arruda, Darlene; Machado, Hélio Rubens; Sakamoto-Hojo, Elza Tiemi; Tone, Luiz Gonzaga (Neuropathology, 2009)