http://www.medterms.com/script/main/art.asp?articlekey=10697 Examples of progressive neurodegenerative diseases are Alzheimers and Bovine spongiform encephalopathy. In both cases the neurodegeneration is continuous over the course of the illness. Just because schizophrenia presents with initial neurodegeneration doesn't mean that it has continuous neurogeneration, and if the neurogeneration caused directly by schizophrenia is discrete then it doesn't qualify schizophrenia as being a progressive disease.