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In page Psychosis:

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Cycloid psychosis is typically an acute, self-limiting form of psychosis with psychotic and mood symptoms that progress from normal to full-blown, usually between a few hours to days, and not related to drug intake or brain injury.[1] While proposed as a distinct entity, clinically separate from schizophrenia and affective disorders, cycloid psychosis is not formally acknowledged by current ICD or DSM criteria.[1] Its unclear place in psychiatric nosology has likely contributed to the limited scientific investigation and literature on the topic.[citation needed]