abnormal forebrain morphology brain atrophy forebrain atrophy csmith acquired diminution of the size of the forebrain associated with wasting as from death and reabsorbtion of cells, diminished cellular proliferation, decreased cellular volume, pressure, ischemia, malnutrition, reduced function or malfunction, or hormonal changes prosencephalon atrophy MPheno.ontology atrophic prosencephalon MP:0012508 2014-01-01T11:30:46Z atrophic forebrain