organic brain syndrome

Main Entry: organic brain syndrome
Function: noun
: any acute or chronic mental dysfunction (as delirium or senile dementia) resulting chiefly from physical changes inbrain structure and characterized especially by impaired cognition called also organic brain disorder, organic mental syndrome

organic brain syndrome n.
Abbr. OBS
Any of a group of acute or chronic syndromes involving temporary or permanent impairment of brain function caused by trauma, infection, toxin, tumor, or tissue sclerosis, and causing mild-to-severe impairment of memory, orientation, judgment, intellectual functions, and emotional adjustment. Also called organic mental syndrome.