{"title":"进行性核上性麻痹的I-Beam征。","authors":"Sandhya Manorenj, Shashanka Chillapuram","doi":"10.4103/neurol-india.Neurol-India-D-24-00101","DOIUrl":null,"url":null,"abstract":"<p><strong>Background: </strong>Postural instability occurs in both progressive supranuclear palsy (PSP) and idiopathic Parkinson's disease (IPD).</p><p><strong>Objective: </strong>Testing for postural instability using a pull test helps to differentiate IPD from PSP based on the presence of an I-beam sign in the latter.</p><p><strong>Methods and materials: </strong>Here, we demonstrate the I-beam sign in a 65-year-old lady who presented with initial marked postural instability.</p><p><strong>Results: </strong>In PSP, postural instability occurs early. Here, we found that in patients with PSP on the backward pull test, they fall without taking a single step, like a building falls without an I-beam. This sign is called I-beam sign. In patients with IPD, this sign is absent as they take one or a few steps before falling. Clinical examination showed mild restriction of upward gaze, and there was radiological evidence of midbrain atrophy. The present case was diagnosed as PSP with a postural instability variant.</p><p><strong>Conclusion: </strong>The presence of the I-beam sign in patients with Parkinsonism suggests PSP.</p>","PeriodicalId":19429,"journal":{"name":"Neurology India","volume":"73 2","pages":"330-331"},"PeriodicalIF":0.9000,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"I-Beam Sign in Progressive Supranuclear Palsy.\",\"authors\":\"Sandhya Manorenj, Shashanka Chillapuram\",\"doi\":\"10.4103/neurol-india.Neurol-India-D-24-00101\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><strong>Background: </strong>Postural instability occurs in both progressive supranuclear palsy (PSP) and idiopathic Parkinson's disease (IPD).</p><p><strong>Objective: </strong>Testing for postural instability using a pull test helps to differentiate IPD from PSP based on the presence of an I-beam sign in the latter.</p><p><strong>Methods and materials: </strong>Here, we demonstrate the I-beam sign in a 65-year-old lady who presented with initial marked postural instability.</p><p><strong>Results: </strong>In PSP, postural instability occurs early. Here, we found that in patients with PSP on the backward pull test, they fall without taking a single step, like a building falls without an I-beam. This sign is called I-beam sign. In patients with IPD, this sign is absent as they take one or a few steps before falling. Clinical examination showed mild restriction of upward gaze, and there was radiological evidence of midbrain atrophy. The present case was diagnosed as PSP with a postural instability variant.</p><p><strong>Conclusion: </strong>The presence of the I-beam sign in patients with Parkinsonism suggests PSP.</p>\",\"PeriodicalId\":19429,\"journal\":{\"name\":\"Neurology India\",\"volume\":\"73 2\",\"pages\":\"330-331\"},\"PeriodicalIF\":0.9000,\"publicationDate\":\"2025-03-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Neurology India\",\"FirstCategoryId\":\"3\",\"ListUrlMain\":\"https://doi.org/10.4103/neurol-india.Neurol-India-D-24-00101\",\"RegionNum\":3,\"RegionCategory\":\"医学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"2025/4/3 0:00:00\",\"PubModel\":\"Epub\",\"JCR\":\"Q4\",\"JCRName\":\"NEUROSCIENCES\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Neurology India","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.4103/neurol-india.Neurol-India-D-24-00101","RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/4/3 0:00:00","PubModel":"Epub","JCR":"Q4","JCRName":"NEUROSCIENCES","Score":null,"Total":0}
Background: Postural instability occurs in both progressive supranuclear palsy (PSP) and idiopathic Parkinson's disease (IPD).
Objective: Testing for postural instability using a pull test helps to differentiate IPD from PSP based on the presence of an I-beam sign in the latter.
Methods and materials: Here, we demonstrate the I-beam sign in a 65-year-old lady who presented with initial marked postural instability.
Results: In PSP, postural instability occurs early. Here, we found that in patients with PSP on the backward pull test, they fall without taking a single step, like a building falls without an I-beam. This sign is called I-beam sign. In patients with IPD, this sign is absent as they take one or a few steps before falling. Clinical examination showed mild restriction of upward gaze, and there was radiological evidence of midbrain atrophy. The present case was diagnosed as PSP with a postural instability variant.
Conclusion: The presence of the I-beam sign in patients with Parkinsonism suggests PSP.
期刊介绍：
Neurology India (ISSN 0028-3886) is Bi-monthly publication of Neurological Society of India. Neurology India, the show window of the progress of Neurological Sciences in India, has successfully completed 50 years of publication in the year 2002. ‘Neurology India’, along with the Neurological Society of India, has grown stronger with the passing of every year. The full articles of the journal are now available on internet with more than 20000 visitors in a month and the journal is indexed in MEDLINE and Index Medicus, Current Contents, Neuroscience Citation Index and EMBASE in addition to 10 other indexing avenues.
This specialty journal reaches to about 2000 neurologists, neurosurgeons, neuro-psychiatrists, and others working in the fields of neurology.
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