{"title":"Difficult Differential Diagnosis of Paraneoplastic Neuromuscular Diseases Associated with Small Cell lung Cancer: A Report of Two Cases.","authors":"Kohei Umemoto, Katsuyoshi Tomomatsu, Mika Urata, Eriko Okazaki, Kai Yamazaki, Tomohiro Yoshikawa, Naoki Okada, Shigeaki Hattori, Tomoe Takeuchi, Yukihiro Horio, Hiroto Takiguchi, Kyoko Niimi, Naoki Hayama, Yoko Ito, Ryoko Imazeki, Tsuyoshi Oguma, Eiichiro Nagata, Koichiro Asano","doi":"","DOIUrl":null,"url":null,"abstract":"<p><p>Lambert-Eaton myasthenic syndrome (LEMS) is a paraneoplastic neurological syndrome complication of small cell lung cancer (SCLC). The clinical symptoms of LEMS overlap with those of myasthenia gravis (MG), leading to misdiagnosis. Herein, we report two cases of SCLC with LEMS-like disease that were difficult to distinguish from MG because of atypical electromyographic findings without waxing patterns on high-frequency stimulation. Both patients responded poorly to oral pyridostigmine and intravenous immunoglobulin, and were reported to be positive for the anti-P/Q-type voltage-gated calcium channel antibody characteristic of LEMS. Differentiating between LEMS and MG based on clinical symptoms and EMG findings can be difficult.</p>","PeriodicalId":38819,"journal":{"name":"Tokai Journal of Experimental and Clinical Medicine","volume":"49 4","pages":"144-147"},"PeriodicalIF":0.0000,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Tokai Journal of Experimental and Clinical Medicine","FirstCategoryId":"1085","ListUrlMain":"","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"Medicine","Score":null,"Total":0}
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Abstract
Lambert-Eaton myasthenic syndrome (LEMS) is a paraneoplastic neurological syndrome complication of small cell lung cancer (SCLC). The clinical symptoms of LEMS overlap with those of myasthenia gravis (MG), leading to misdiagnosis. Herein, we report two cases of SCLC with LEMS-like disease that were difficult to distinguish from MG because of atypical electromyographic findings without waxing patterns on high-frequency stimulation. Both patients responded poorly to oral pyridostigmine and intravenous immunoglobulin, and were reported to be positive for the anti-P/Q-type voltage-gated calcium channel antibody characteristic of LEMS. Differentiating between LEMS and MG based on clinical symptoms and EMG findings can be difficult.
期刊介绍：
The Tokai Journal of Experimental and Clinical Medicine, also referred to as Tokai Journal, is an official quarterly publication of the Tokai Medical Association. Tokai Journal publishes original articles that deal with issues of clinical, experimental, socioeconomic, cultural and/or historical importance to medical science and related fields. Manuscripts may be submitted as full-length Original Articles or Brief Communications. Tokai Journal also publishes reviews and symposium proceedings. Articles accepted for publication in Tokai Journal cannot be reproduced elsewhere without written permission from the Tokai Medical Association. In addition, Tokai Journal will not be held responsible for the opinions of the authors expressed in the published articles.
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