This image is of 28-year-old identical twins, one with schizophrenia and the other well It therefore clearly illustrates two points: (1)schizophrenia is a brain disease with measurable structural and functional abnormalities in the brain; and (2)it is not a purely genetic disease, and other biological factors play a role in its etiology. SCHIZOPHRENIA IN IDENTICAL TWINS IP Photo countesy of Drs E FuWer Torrey and Danie/ Weinberger MRI scans of 28-year-old male identical twins showing the enlarged brain ventricles in the twin with schizophrenia(right) compared to his well brother(left)