What is the difference between schizotypal personality disorder with psychosis and schizophrenia or delusional disorder?

Rare disorders, huh?: A quick partial reply: there are more than one form of sz, but experts could differ between spdw/(p) & sz in how they'd view a w/drawn & odd case. Also, the 1st can develop into sz over time and the boundaries could be fuzzy. Dd is different. It is limited to non-bizarre but untrue fixed ideas or beliefs. Otherwise no problematic symptoms are evident. It is particularly rare for that reason.

Significant diff's: People with schizotypal personality are characterized by marked eccentricity in thought and behavior. Any additional psychosis is not felt to represent a primary psychotic disorder such as schizophrenia. The psychotic disorder is sometimes thought to be secondary outgrowth from the schizotypal personality disorder who has been stressed. Delusional disorder is simply an isolated delusion in the absence of a major psychosis such as schizophrenia. Schizophrenia is characterized by hallucinatory experiences, marked decrease in psychosocial function, and what are referred to as negative symptoms referring to the psycho social isolation that is experienced.

Very similar: These disorders have a great deal of overlap between the two of them. Get a second opinion from another psychiatrist to confirm or refute the original diagnosis.