Kenji Kosaka (psychiatrist)

Kenji Kosaka (小阪 憲司, Kosaka Kenji, born 1939) is a Japanese psychiatrist, known for his pioneer research on Dementia with Lewy bodies (DLB), which he first described.[1]

Kenji Kosaka
Native name
小阪 憲司
Alma materKanazawa University
Known forDementia with Lewy bodies
AwardsAsahi Prize (2013)
Scientific career
InstitutionsYokohama City University


Kosaka was born in Ise, Mie, and completed his M.D. in 1965 from Kanazawa University.[1] He was appointed as a professor of psychiatry at Yokohama City University School of Medicine in 1991, before becoming a director of Yokohama City University Medical Center in 1995.[1] He has been a director of Medical Care Court Clinic in Yokohama since 2011.[2]

He received the 2013 Asahi Prize for discovering Dementia with Lewy bodies.[3]


In 1976, Kosaka described the concept of Dementia with Lewy bodies for the first time.[4] Two years later, he reported three autopsied cases of Dementia with Lewy bodies.[5]

The term Dementia with Lewy bodies was proposed at the first international workshop held in 1995, and is now in common use.[6]


  1. 小阪名誉教授 [Professor Emeritus Kosaka] (in Japanese). Ashitaba Mental Clinic. Retrieved February 3, 2014.
  2. メディカルケアコートクリニック [Medical Care Court Clinic] (in Japanese). Medical Care Court Clinic. Retrieved February 3, 2014.
  3. "The Asahi Prize". Retrieved February 3, 2014.
  4. Kosaka K, Oyanagi S, Matsushita M, Hori A (1976). "Presenile dementia with Alzheimer-, Pick- and Lewy-body changes". Acta Neuropathol. 36 (3): 221–233. doi:10.1007/bf00685366. PMID 188300.
  5. Kosaka K. (1978). "Lewy bodies in cerebral cortex, report of three cases". Acta Neuropathol. 42 (2): 127–134. doi:10.1007/bf00690978. PMID 654884.
  6. レビー小体型認知症研究会 [Japanese Society for Dementia with Lewy bodies] (in Japanese). Retrieved February 3, 2014.
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