What are the odds that someone has schizophrenia given that they have brain atrophy?

Too big of a: question. What is causing the brain atrophy, which parts of the brain are involved, how long has this been going on? These are questions first for a neurologist, and probably a psychiatrist, second. Brain atrophy is a condition where there are less cells and/or there are less connected cells, which can cause cognitive problems, some of which might look like schizophrenia (more like OBS).