Memory deficits due to brain injury: Unique PET findings and dream alterations

Masaki Nishida*, Tadashi Nariai, Mikio Hiura, Kenji Ishii, Toru Nishikawa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The authors herein report the case of a young male with memory deficits due to a traumatic head injury, who presented with sleep-related symptoms such as hypersomnia and dream alterations. Although MRI and polysomnography showed no abnormalities, 18F-fluorodeoxyglucose positron emission tomography (FDG-PET) and 11C flumazenil (FMZ)-PET revealed findings consistent with cerebral damage to the affected temporal region. The memory deficit of the patient gradually improved in parallel with the relief of the sleep-related symptoms. FDG-PET showed considerable improvement in glucose metabolism when he had recovered, however, evidence of neural loss remained in the FMZ-PET findings.

Original languageEnglish
JournalBMJ Case Reports
Publication statusPublished - 2011
Externally publishedYes

ASJC Scopus subject areas

  • Medicine(all)


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