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This sign helps to clinically differentiate atypical parkinsonism diseases, especially in the early stages, when many conditions are similar, in terms of clinical presentation and poor response to levodopa. Thus, the procerus sign can be an important clue in the suspicion of PSP.<\/jats:p>","DOI":"10.1055\/s-0046-1824436","type":"journal-article","created":{"date-parts":[[2026,6,23]],"date-time":"2026-06-23T23:35:05Z","timestamp":1782257705000},"page":"001-003","source":"Crossref","is-referenced-by-count":0,"title":["Procerus sign as a diagnostic clue for progressive supranuclear palsy"],"prefix":"10.1055","volume":"84","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8644-4937","authenticated-orcid":false,"given":"Gabriel de Deus","family":"Vieira","sequence":"additional","affiliation":[{"name":"Universidade Estadual de Campinas, Faculdade de Ci\u00eancias M\u00e9dicas, Laborat\u00f3rio de Neuroimagem, Campinas SP, Brazil."},{"name":"Universidade da Regi\u00e3o de Joinville, Departamento de Medicina, Disciplina de Neurologia, Joinville SC, 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