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Insulinoma resembling a rapid eye movement sleep behavior disorder: a case report

Authors Kishi K, Kubo K, Tomita T, Nakamura K, Yasui-Furukori N

Received 5 January 2019

Accepted for publication 31 January 2019

Published 21 February 2019 Volume 2019:12 Pages 51—54


Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Dr Amy Norman

Peer reviewer comments 2

Editor who approved publication: Professor Ronald Prineas

Kenji Kishi, Kazutoshi Kubo, Tetsu Tomita, Kazuhiko Nakamura, Norio Yasui-Furukori

Department of Neuropsychiatry, Hirosaki University Graduate School of Medicine, Hirosaki, Japan

Abstract: Some patients with insulinoma present with neuropsychiatric symptoms and are often misdiagnosed with psychiatric disease. We present the case of a 72-year-old Japanese female who exhibited violent behavior while asleep and received a diagnosis of suspected rapid eye movement sleep behavior disorder (RBD). She was admitted to the psychiatry ward after receiving levomepromazine 25 mg intramuscularly. The patient’s blood glucose level was 27 mg/dL at the time of hospitalization, and a biochemical examination revealed that her insulin level was 9.1 µU/mL and C-peptide level was 2.16 ng/mL. A contrast-enhanced computed tomography revealed a mass 8 mm in diameter in the pancreatic head. The diagnosis was changed from RBD to insulinoma. The sleep behavior disorder disappeared after continuous glucose administration. After enucleation of the insulinoma, the administration of glucose was discontinued, and her blood glucose levels recovered. This case suggests that insulinoma should be considered by physicians and psychiatrists in the differential diagnosis of patients with symptoms presenting as RBD.

Keywords: insulinoma, differential diagnosis, hypoglycemia, rapid eye movement sleep behavior disorder

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