Cerebral degeneration in Down's syndrome.
D000328:Adult; D000368:Aged; D000375:Aging; D001921:Brain / Q000503:physiopathology*; D002648:Child; D004314:Down Syndrome / Q000503:physiopathology*; D005500:Follow-Up Studies; D006801:Humans; D007360:Intelligence; D008875:Middle Aged