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Reduplicative paramnesia after a right frontal lesion
Koomi Lee1, Michiko Shinbo, Hinako Kanai
1The Department of Neurology, IMS Itabashi Rehabilitation Hospital, Azusawa, Itabashi-ku, Tokyo, Japan. ri.kumi@ims.gr.jp
A right frontal subcortical lesion can cause reduplicative paramnesia, a rare cognitive disturbance. This case highlights the potential for localized brain lesions to trigger complex delusions, emphasizing the need for further clinical data.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Neurology
Background:
- Reduplicative paramnesia is a rare delusion where individuals believe a place or person has been duplicated.
- Right frontal subcortical lesions are implicated, but clinical data remain scarce.
Observation:
- A 69-year-old male presented with reduplicative paramnesia following a focal lesion.
- Clinical, neuropsychological, and neuroradiologic assessments were conducted.
Findings:
- The patient exhibited visuospatial impairment, memory deficits, anosognosia, and mild frontal dysfunction.
- MRI revealed a right inferior posterior frontal subcortical lesion impacting key neural pathways involved in visuospatial processing, memory, and familiarity.
- A paranoid personality and environmental changes may have precipitated the delusion.
Implications:
- A localized right inferior posterior frontal subcortical lesion can induce cognitive dysfunction leading to reduplicative paramnesia.
- This case underscores the link between specific brain lesions and complex delusional disorders.
- Further research is needed to understand the neurobiological underpinnings of reduplicative paramnesia.
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