[P4–436]: PROMINENT MICROGLIAL ACTIVATION IN CORTICAL WHITE MATTER IS SELECTIVELY ASSOCIATED WITH CORTICAL ATROPHY IN PRIMARY PROGRESSIVE APHASIA. (1st July 2017) - Ohm, Daniel T.; Kim, Garam; Gefen, Tamar; Rademaker, Alfred; Weintraub, Sandra; Bigio, Eileen H.; Mesulam, Marsel; Rogalski, Emily J.; Geula, Changiz