Residual schizophrenia is a type of schizophrenia that comes after an active psychotic episode. For the diagnosis of residual schizophrenia to be made, there must be no positive symptom (schizophasia, delusions, or hallucinations).
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Residual schizophrenia is a type of schizophrenia that includes negative symptoms, but not overt positive symptoms like hallucinations or delusions after a schizophrenic episode that involved positive symptoms. For example, someone who had hallucinations, flat affect, and social withdrawal six months ago, but who now only has flat affect and social withdrawal, probably has residual schizophrenia.