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A 34-year-old woman is brought to the psychiatric clinic by her sister, who reports the patient has been increasingly withdrawn over the past 6 weeks. The patient describes pervasive sadness, anhedonia, insomnia with early morning awakening, a 12-pound weight loss, and psychomotor retardation. During the interview, she reveals she hears a voice telling her she is 'worthless and should disappear.' She reports that the voice started approximately 3 weeks after her mood began deteriorating and states she has never heard voices when she is feeling well. Her sister confirms that between depressive episodes, the patient functions at her baseline with no perceptual disturbances. Previous psychiatric history includes two prior major depressive episodes, one of which also involved auditory hallucinations that resolved completely with remission of the depressive episode. There is no history of manic or hypomanic episodes. Which of the following is the most accurate diagnosis?
Explanation
The critical distinction between MDD with psychotic features and schizoaffective disorder rests on whether psychotic symptoms occur exclusively during mood episodes or also persist independently. In this case, hallucinations emerge only after depressive onset and resolve completely with mood episode remission, confirming MDD with psychotic features. Schizoaffective disorder requires at least 2 weeks of hallucinations or delusions in the absence of a major mood episode.
Key Takeaway
MDD with psychotic features is diagnosed when psychosis occurs exclusively during mood episodes, while schizoaffective disorder requires psychotic symptoms persisting for at least 2 weeks independent of mood episodes.