Two Different Primary Brain Tumors, Glioblastoma Multiforme and Pituitary Adenoma, in Association with Colorectal Carcinoma – An Unusual Case of Nonfamilial Turcot's Syndrome? - Naydenov, E.; Marinov, M.; Nachev, S. (Journal of Neurological Surgery Part A: Central European Neurosurgery, 2012)