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Case Lab · Type B · Boundary

F29

Actually, there's enough to say more

A young man is brought to an emergency department acutely agitated and responding to unseen stimuli. Unlike a true first contact, his sister arrives shortly afterward and gives a clear collateral history: he was completely well four days ago, the agitation and unusual beliefs began suddenly after he lost his job, his beliefs have been shifting from one theme to another over the four days, and he has no psychiatric history, no substance use, and no medical illness.

What is the best-supported classification?