A 20 year old boy c/o hearing of voices, aggressive behavior for 2 days. He has a fever for 2 days. When asked to his family, they say that he has been muttering to self and gesticulating. There is no h/o of psychiatric illness. Likely diagnosis is-
**Core Concept**
Schizophrenia is a psychiatric disorder characterized by a disconnection between thought, emotion, and behavior, often manifesting as hallucinations, delusions, disorganized speech, and catatonic behavior. This disorder can be acute or chronic and may be precipitated by various factors, including infections, substance abuse, and genetic predisposition.
**Why the Correct Answer is Right**
The presence of auditory hallucinations (hearing voices), disorganized behavior (gesticulating), and a recent onset of symptoms in the absence of a previous psychiatric history are characteristic features of schizophrenia. The patient's catatonic behavior, such as muttering to himself, is a manifestation of the disorder's impact on thought and emotion. This clinical presentation is often referred to as a "first-episode psychosis," which can be a precursor to schizophrenia.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not account for the patient's catatonic behavior and the absence of a previous psychiatric history. While a first-episode psychosis can be a precursor to schizophrenia, it is not a definitive diagnosis without further evaluation.
**Option B:** This option is incorrect because it does not consider the patient's recent onset of symptoms and the absence of a previous psychiatric history. Substance-induced psychosis can occur, but it would typically be preceded by a history of substance abuse.
**Option C:** This option is incorrect because it does not account for the patient's catatonic behavior and the presence of auditory hallucinations. Schizoaffective disorder can present with psychotic symptoms, but it would typically be accompanied by a mood disorder.
**Clinical Pearl / High-Yield Fact**
When evaluating a patient with a first-episode psychosis, it is essential to consider a comprehensive differential diagnosis, including schizophrenia, substance-induced psychosis, and schizoaffective disorder. A thorough medical and psychiatric history, as well as a physical examination and laboratory tests, can help differentiate between these conditions.
**Correct Answer:** C.