schizophreniform disorder

**Definition (DSM-5-TR):** Two or more of the following, each present for a significant portion of a 1-month period (at least one must be #1-3): (1) delusions, (2) hallucinations, (3) disorganized speech, (4) grossly disorganized or catatonic behavior, (5) negative symptoms (flat affect, alogia, avolition). The total duration of the illness, including prodromal and residual phases, is ≥1 month but <6 months. Impaired social/occupational functioning is NOT required for the diagnosis (unlike schizophrenia). Schizoaffective disorder, mood disorder with psychotic features, substance-induced psychosis, and psychosis from a medical condition must be ruled out.

**Specifiers:** "With good prognostic features" (requires ≥2 of: onset of prominent psychotic symptoms within 4 weeks of first noticeable change in behavior, confusion or perplexity at the height of the psychotic episode, good premorbid social and occupational functioning, absence of blunted or flat affect). "Without good prognostic features." Catatonia can also be specified.

**Duration comparison (high-yield):** - Brief psychotic disorder: ≥1 day but <1 month, with full return to baseline. - Schizophreniform disorder: ≥1 month but <6 months. - Schizophrenia: ≥6 months, with ≥1 month of active-phase symptoms.

**Epidemiology and etiology:** Typically presents in late teens to early 30s. Lifetime prevalence is about 0.2%. It is thought to share the same genetic and neurobiological basis as schizophrenia (dopamine D2 overactivity in the mesolimbic pathway, glutamate/NMDA hypofunction, and increased family risk). Family history of schizophrenia raises risk.

**Clinical course and prognosis:** About two-thirds of patients progress to schizophrenia or schizoaffective disorder. The remaining third recover fully. Good prognostic factors include acute onset, good premorbid function, confusion at the peak of illness, and absence of flat affect. The diagnosis is sometimes made provisionally ("provisional" if the patient has not yet recovered but the 6 months have not elapsed).

**Management:** - Second-generation (atypical) antipsychotics are first line (e.g., risperidone, olanzapine, aripiprazole, quetiapine). - Add psychosocial support, psychoeducation, and family therapy. - Duration of treatment is not firmly established. A common approach is to continue medication for several months to a year after remission, then taper if the patient is stable. Treat as schizophrenia if the illness persists beyond 6 months. - Hospitalization may be needed for safety (suicide risk, command hallucinations) or when the patient cannot care for themselves. - Rule out organic causes first: urine drug screen, TSH, CBC, CMP, HIV/RPR when indicated, and neuroimaging if there are focal findings. Consider substance-induced psychosis (amphetamines, PCP, cannabis), temporal lobe epilepsy, and autoimmune encephalitis (anti-NMDA receptor).

**Exam pearls:** - Vignette: a 20-year-old with 3 months of hallucinations, delusions, and disorganized speech → schizophreniform disorder. The same presentation for 8 months → schizophrenia. The same presentation for 2 weeks → brief psychotic disorder. - Functional decline is not required for the schizophreniform diagnosis. - Mood symptoms that last for most of the illness suggest schizoaffective disorder or a mood disorder with psychotic features. - Suicide risk is significant (similar to schizophrenia), so assess it in all patients.