delusions:
The patient believes others have been replaced by identical or near identical impostors. Can apply to animals and other objects, and often associated with aggressive behaviour
?Fregoli delusions:
Patient identifies a familiar person (usually his persecutor) in various other people he encounters (psychologically only).
?Intermetamorphosis syndrome:
The patient believes they can see others change into someone else (both external and internal appearance). Physically and psychologically
?Subjective doubles delusions (Doppelganger):
The patient believes there is a double who exist and functions independently
?Reversed subjective double syndrome:
The patient believes that they are an impostor in the process of being physically and psychologically replaced.
Autoscopic syndrome:
The patient sees a double of themselves projected onto other people or objects nearby
References:
1. Stevens L, Rodin I, Psychiatry: An illustrated colour text, Churchill Livingstone 2001
2. Steple D. Oxford Handbook of Psychiatry, Oxford University Press, 2006
3. World Health Organisation (WHO): ICD10 Classification of Mental and Behavioural Disorders (1992)
4. American Psychiatric Association. The Diagnostic and statistical Manual of Mental Disorders (DSM-IV).1994
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