What Are the Signs of a Degenerative Illness?

In persistent psychotic disorders like schitsophrenia, there's an awful lot of concern that its an illness that may a degenerative illness. We all have empty space in our braint because when nerve cells die off, they're replaced by empty space. People talk about enlarged ventricles or abnormal atrophy in the cortex as signs that nerve cells have died off in some one that's been ill for many years.