{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,18]],"date-time":"2026-07-18T09:59:03Z","timestamp":1784368743938,"version":"3.55.0"},"reference-count":45,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2022,4,8]],"date-time":"2022-04-08T00:00:00Z","timestamp":1649376000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Muscle and Nerve"],"published-print":{"date-parts":[[2022,6]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Introduction\/Aims<\/jats:title><jats:p>Immunoglobulin M neuropathy associated with anti\u2010myelin\u2010associated glycoprotein antibody (IgM\/anti\u2010MAG) neuropathy typically presents with chronic, distal\u2010dominant symmetrical sensory or sensorimotor deficits. Ultrasonographic studies of IgM\/anti\u2010MAG neuropathy are limited, and were all performed on Western populations. We aimed to characterize the nerve ultrasonographic features of IgM\/anti\u2010MAG neuropathy in the Japanese population and evaluate whether they differ from the findings of the common subtypes of chronic inflammatory demyelinating polyneuropathy (CIDP).<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>In this cross\u2010sectional study, we retrospectively reviewed medical records and extracted the cross\u2010sectional areas (CSAs) of C5\u2013C7 cervical nerve roots and median and ulnar nerves of 6 IgM\/anti\u2010MAG neuropathy patients, 10 typical CIDP (t\u2010CIDP) patients, 5 multifocal CIDP (m\u2010CIDP) patients, and 17 healthy controls (HCs).<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Cervical nerve root CSAs were significantly larger at every examined site on both sides in IgM\/anti\u2010MAG neuropathy than in m\u2010CIDP and HCs but were comparable to those in t\u2010CIDP. Peripheral nerve enlargements were greatest at common entrapment sites (ie, wrist and elbow) in IgM\/anti\u2010MAG neuropathy, a pattern shared with t\u2010CIDP but not with m\u2010CIDP. The degree of nerve enlargement at entrapment sites compared to non\u2010entrapment sites was significantly higher in IgM\/anti\u2010MAG neuropathy than in t\u2010CIDP.<\/jats:p><\/jats:sec><jats:sec><jats:title>Discussion<\/jats:title><jats:p>Our study delineated the ultrasonographic features of IgM\/anti\u2010MAG neuropathy in the Japanese population and observed similar characteristics to those of t\u2010CIDP, with subtle differences. Further studies comparing results from various populations are required to optimize the use of nerve ultrasound worldwide.<\/jats:p><\/jats:sec>","DOI":"10.1002\/mus.27542","type":"journal-article","created":{"date-parts":[[2022,3,30]],"date-time":"2022-03-30T18:04:49Z","timestamp":1648663489000},"page":"667-675","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Nerve ultrasound characteristics of immunoglobulin M neuropathy associated with anti\u2010myelin\u2010associated glycoprotein antibodies"],"prefix":"10.1002","volume":"65","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8681-0167","authenticated-orcid":false,"given":"Yuwa","family":"Oka","sequence":"first","affiliation":[{"name":"Department of Neurology Kansai Electric Power Hospital Osaka Japan"},{"name":"Division of Clinical Neurology Kansai Electric Power Medical Research Institute Osaka Japan"},{"name":"Department of Neurology Kitano Hospital, Tazuke 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