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Acute and transient psychotic disorders matter because they describe a psychosis that comes on within days, changes rapidly in form, and then resolves completely, unlike the persistent course of schizophreniaA long-term mental illness involving episodes of psychosis such as hallucinations and delusions.Read more →. It is diagnosed when psychotic symptoms appear suddenly, over 2 weeks or less, often shift dramatically in content from day to day (called polymorphic), and full recovery is expected within about 1 to 3 months. For example, imagine a young woman who becomes acutely paranoid over a single weekend, with her delusionsA fixed false belief, held with total conviction, that is not shared by the person's culture and is not changed by evidence against it.Read more → and hallucinationsSeeing, hearing, or otherwise sensing things that are not really there.Read more → changing character almost daily, then makes a complete recovery within weeks. In practice, that sudden onset plus full recovery, rather than the specific symptoms present, is what defines this diagnosis.

The defining features are an abrupt onset, within 2 weeks and often within 48 hours, a polymorphic or schizophreniaA long-term mental illness involving episodes of psychosis such as hallucinations and delusions.Read more →-like symptom picture, and complete resolution, typically within 1 to 3 months. Psychosocial stress often precedes the episode, though this is not required for the diagnosis. Say a patient's delusionsA fixed false belief, held with total conviction, that is not shared by the person's culture and is not changed by evidence against it.Read more → shift from persecutory to grandiose within the same week, alongside fleeting hallucinationsSeeing, hearing, or otherwise sensing things that are not really there.Read more → that come and go: that instability of content is the polymorphic pattern naming this disorder. In practice, the diagnosis is often made retrospectively, once the expected full recovery has actually occurred.

• What is the usual outcome of an acute and transient psychotic disorder?
• In which group is acute and transient psychotic disorder most commonly reported?
• A woman becomes floridly psychotic with rapidly changing symptoms five days after giving birth. What must be assumed until proven otherwise?

• Schizophrenia, persistent symptoms lasting at least a month with ongoing impairment, unlike this disorder's rapid, complete recovery.
• Psychotic mood episode, psychosis confined to, and congruent with, a manic or depressive episode, rather than the mood-independent picture here.
• Delusional disorder, a stable, singular delusionalRelating to a fixed false belief held with total conviction despite evidence against it.Read more → theme lasting months, unlike this disorder's rapid, polymorphic symptom shifts.
• Schizophreniform disorder, symptoms lasting 1 to 6 months, rather than the rapid polymorphic shifting seen in acute and transient psychotic disorder.

• A minority later develop schizophreniaA long-term mental illness involving episodes of psychosis such as hallucinations and delusions.Read more →, but that is not the usual course.
• Dementia is not an outcome of this disorder.
• Chronic residual symptoms would be inconsistent with the diagnosis.
• The pattern runs the other way on both counts.
• It is an adult-onset presentation rather than a prepubertal one.

• Extract the defining phenomenology, duration, severity and functional-impact clues.
• Match the pattern to the most specific diagnostic or assessment construct.
• Actively test the closest look-alike against the missing or contradictory clue.
• Choose the precise term rather than a broader category that is merely compatible.