{"title":"Pembrolizumab-Induced Anti-Yo-Antibody-Positive Cerebellitis: A Case Report.","authors":"Takafumi Yamano, Toshihide Yokoyama, Tadashi Ishida","doi":"10.1002/rcr2.70160","DOIUrl":null,"url":null,"abstract":"<p><p>We report a rare case of pembrolizumab-induced anti-Yo-antibody-positive cerebellitis in a patient with stage IV lung adenocarcinoma. Following two cycles of combination therapy, the patient developed nystagmus and ataxia. Despite tumour regression and normal magnetic resonance imaging (MRI) findings, cerebrospinal fluid analysis revealed lymphocyte-dominant hypercellularity, increased protein, and oligoclonal bands. Immune checkpoint inhibitor (ICI)-related cerebellitis was diagnosed after excluding infectious causes, metastases, and cancerous meningitis coupled with a positive anti-Yo antibody. Methylprednisolone pulse was ineffective, but high-dose intravenous immunoglobulin therapy resolved symptoms. To the best of our knowledge, this is the first case report of ICI-related cerebellitis with anti-Yo-antibody in lung adenocarcinoma. This case highlights the importance of paraneoplastic antibody testing in diagnosing ICI-related encephalitis, especially in cases of normal MRI findings.</p>","PeriodicalId":45846,"journal":{"name":"Respirology Case Reports","volume":"13 3","pages":"e70160"},"PeriodicalIF":0.8000,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11932737/pdf/","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Respirology Case Reports","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1002/rcr2.70160","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/3/1 0:00:00","PubModel":"eCollection","JCR":"Q4","JCRName":"RESPIRATORY SYSTEM","Score":null,"Total":0}
引用次数: 0
Abstract
We report a rare case of pembrolizumab-induced anti-Yo-antibody-positive cerebellitis in a patient with stage IV lung adenocarcinoma. Following two cycles of combination therapy, the patient developed nystagmus and ataxia. Despite tumour regression and normal magnetic resonance imaging (MRI) findings, cerebrospinal fluid analysis revealed lymphocyte-dominant hypercellularity, increased protein, and oligoclonal bands. Immune checkpoint inhibitor (ICI)-related cerebellitis was diagnosed after excluding infectious causes, metastases, and cancerous meningitis coupled with a positive anti-Yo antibody. Methylprednisolone pulse was ineffective, but high-dose intravenous immunoglobulin therapy resolved symptoms. To the best of our knowledge, this is the first case report of ICI-related cerebellitis with anti-Yo-antibody in lung adenocarcinoma. This case highlights the importance of paraneoplastic antibody testing in diagnosing ICI-related encephalitis, especially in cases of normal MRI findings.
期刊介绍：
Respirology Case Reports is an open-access online journal dedicated to the publication of original clinical case reports, case series, clinical images and clinical videos in all fields of respiratory medicine. The Journal encourages the international exchange between clinicians and researchers of experiences in diagnosing and treating uncommon diseases or diseases with unusual presentations. All manuscripts are peer-reviewed through a streamlined process that aims at providing a rapid turnaround time from submission to publication.
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