title: [Peduncular hallucinosis due to a small hemorrhage around the substantia nigra: a case report].
abstract: An 81-year-old female developed peduncular hallucination due to a small hemorrhage around the right substantia nigra is reported. Her hallucination was visual, not accompanying any other type of hallucination. It was vivid, colorful, well described, and recognized as unreal by herself. Different from most of the previous reports, she had no sleep abnormality and the hallucination occurred in daytime and at night, not relating to eye opening or closing. As the lesion of this case was quite restricted to around the right substantia nigra and not affecting the brainstem reticular formation, we speculate that the hallucination itself was induced by the stimulation of mesocorticolimbic system. The other characteristics of the hallucination such as appearing in evening, occurring with eye closing, and accompanying sleep disturbance might be induced when the brainstem involved more widely.
authors.affiliation: Department of Clinical Psychology, School of Social Welfare, Kibi International University, 8 Igamachi, Takahashi-shi, Okayama 716-8508, Japan.
authors.forename: Tomohisa
authors.initials: T
authors.lastname: Furuta
authors.forename: Hideo
authors.initials: H
authors.lastname: Nobutou
authors.forename: Fumiko
authors.initials: F
authors.lastname: Nobutou
mesh_terms: D000368:Aged; D002543:Cerebral Hemorrhage / Q000150:complications*; D005260:Female; D006212:Hallucinations / Q000175:diagnosis / Q000209:etiology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008636:Mesencephalon / Q000473:pathology*; D013378:Substantia Nigra / Q000473:pathology*