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Think of paraphrenia as a single locked room of fixed belief inside an otherwise fully furnished and functioning house — the delusionA fixed false belief, held with total conviction, that is not shared by the person's culture and is not changed by evidence against it.Read more → stays contained while the rest of the person's personality and life carry on almost unchanged.

• Paraphrenia is a historical diagnostic construct, most associated with early-to-mid twentieth century European psychiatry, describing a late-life psychosis with a well-organised, encapsulated delusionalRelating to a fixed false belief held with total conviction despite evidence against it.Read more → system.
• The defining feature is that personality, affect, and general functioning remain strikingly well preserved around the delusionA fixed false belief, held with total conviction, that is not shared by the person's culture and is not changed by evidence against it.Read more →, in contrast to the broader personality and functional deterioration classically described in schizophreniaA long-term mental illness involving episodes of psychosis such as hallucinations and delusions.Read more →.
• The delusionalRelating to a fixed false belief held with total conviction despite evidence against it.Read more → content is typically persecutory and systematised, often involving neighbours, relatives, or unseen intruders, but stays confined to a specific theme rather than fragmenting into disorganised thinking.
• Neither ICD-11 nor DSM-5 retains paraphrenia as a standalone category; equivalent presentations are now captured under delusionalRelating to a fixed false belief held with total conviction despite evidence against it.Read more → disorder (when personality and function are well preserved) or a schizophreniaA long-term mental illness involving episodes of psychosis such as hallucinations and delusions.Read more → spectrum diagnosis (when hallucinationsSeeing, hearing, or otherwise sensing things that are not really there.Read more →, disorganisation, or functional decline are more prominent).
• Sensory impairment, social isolation, and suspicious premorbid personality traits are recognised associated features in the population historically labelled with this term.

• An 82-year-old woman is referred with a two-year history of a fixed, well-organised belief that a neighbour is entering her flat at night to move her belongings.
• A 79-year-old man is described in older psychiatric literature as having paraphrenia rather than schizophreniaA long-term mental illness involving episodes of psychosis such as hallucinations and delusions.Read more → of late onset.
• A psychiatry trainee is reading historical case reports that use the term 'paraphrenia' and asks a consultant why the term has fallen out of routine use in current classification systems.

• Unlike late-onset schizophreniaA long-term mental illness involving episodes of psychosis such as hallucinations and delusions.Read more →, which involves a wider symptom picture with prominent hallucinationsSeeing, hearing, or otherwise sensing things that are not really there.Read more →, looser delusionsA fixed false belief, held with total conviction, that is not shared by the person's culture and is not changed by evidence against it.Read more →, and more noticeable personality change, paraphrenia's defining feature is a preserved personality around one encapsulated delusionalRelating to a fixed false belief held with total conviction despite evidence against it.Read more → system.
• Unlike delusionalRelating to a fixed false belief held with total conviction despite evidence against it.Read more → disorder in current classification, which is the closest modern equivalent, paraphrenia is not itself a current diagnostic label — recognise it as the historical term the question is probing, then map it to the closest modern construct if asked.
• Unlike Capgras syndromeA delusion that a familiar person has been replaced by an identical impostor.Read more →, which specifically involves the belief that a familiar person has been replaced by an impostor, paraphrenia is a general descriptive label, not tied to one specific delusionalRelating to a fixed false belief held with total conviction despite evidence against it.Read more → theme.
• Unlike Charles Bonnet syndromeVivid visual hallucinations in a person with significant vision loss but no other signs of mental illness.Read more →, where vivid visual hallucinationsSeeing, hearing, or otherwise sensing things that are not really there.Read more → occur in visually impaired patients without delusionalRelating to a fixed false belief held with total conviction despite evidence against it.Read more → conviction, paraphrenia is defined by delusionA fixed false belief, held with total conviction, that is not shared by the person's culture and is not changed by evidence against it.Read more → with preserved insightA person's awareness and understanding that they are unwell and need help.Read more → into surrounding reality outside the delusional theme.

• Assuming any late-onset psychosis with persecutory delusionsA fixed false belief, held with total conviction, that is not shared by the person's culture and is not changed by evidence against it.Read more → is 'late-onset schizophreniaA long-term mental illness involving episodes of psychosis such as hallucinations and delusions.Read more →' — check specifically whether personality and affect are preserved, which points instead towards the paraphrenia/delusionalRelating to a fixed false belief held with total conviction despite evidence against it.Read more →-disorder picture.
• Assuming paraphrenia is a current, operational ICD-11 or DSM-5 diagnosis — it is a historical term the exam may probe for recognition or for its modern classificatory fate.
• Assuming preserved personality means the delusionA fixed false belief, held with total conviction, that is not shared by the person's culture and is not changed by evidence against it.Read more → is less serious or less fixed — the delusionalRelating to a fixed false belief held with total conviction despite evidence against it.Read more → conviction can be just as unshakeable as in broader psychotic disorders.
• Confusing paraphrenia with paraphilia — these are unrelated terms describing entirely different clinical concepts.

• Extract the defining phenomenology, duration, severity and functional-impact clues.
• Match the pattern to the most specific diagnostic or assessment construct.
• Actively test the closest look-alike against the missing or contradictory clue.
• Choose the precise term rather than a broader category that is merely compatible.