Brief psychotic disorder is uncommon.
[merckmanuals.com]
Brief psychotic disorder consists of delusions, hallucinations, or other psychotic symptoms for at least 1 day but < 1 month, with eventual return to normal premorbid functioning
[merckmanuals.com]
Preexisting personality disorders (eg, paranoid, histrionic, narcissistic, schizotypal, borderline), as well as certain medical conditions (eg, systemic lupus, steroid ingestion
[merckmanuals.com]