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June 30, 2026BMC PsychiatryOpen Access

Delusional parasitosis with shared psychotic features secondary to vitamin B12 deficiency and mild cognitive impairment: a case report

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Authors

千坂千代子 坂東NONaomichi OkamotoECEnkhmurun Chibaatar

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Overview

Case report reveals shared psychotic features in a patient and caregiver due to vitamin deficiency, indicating evaluation necessity.

Key Points

  • This case report aims to understand the link between visual illusions, delusional parasitosis, and vitamin B12 deficiency in individuals with cognitive impairment.
  • Case presentation of an 80-year-old man with persistent delusions and mild cognitive impairment.
  • Laboratory analysis confirmed vitamin B12 deficiency; brain perfusion imaging showed hypoperfusion.
  • Treatment included low-dose quetiapine and mecobalamin, followed by monitoring for resolution of symptoms.
  • Visual illusions resolved rapidly with treatment, leading to disappearance of delusional beliefs.
  • Follow-up imaging showed improvement in cerebral perfusion.
  • The caregiver's delusional beliefs resolved after the patient’s stabilization and separation.

Cite This Study

坂東 et al. (2026) studied this question.

synapsesocial.com/papers/6a435c08759b888809a528e7https://doi.org/10.1186/s12888-026-08334-0
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