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We report the clinicopathologic course and cytologic cerebrospinal fluid (CSF) findings in a 58\u2010year\u2010old patient with brainstem lesions who originally presented with vertigo but progressed to having left 7th, 8th, 9th, and 10th cranial nerve palsies, right\u2010sided weakness, and occipital headaches. Cytospin of the CSF revealed large epithelioid cells similar to cells seen in a surgical resection of a brain mass three months previously. Review of the surgical specimen revealed a well\u2010differentiated glandular and papillary neoplasm, most consistent with an endolymphatic sac tumor. Diagn. Cytopathol. 2015;43:339\u2013342. \u00a9 2014 Wiley Periodicals, Inc.<\/jats:p>","DOI":"10.1002\/dc.23213","type":"journal-article","created":{"date-parts":[[2014,10,30]],"date-time":"2014-10-30T06:21:52Z","timestamp":1414650112000},"page":"339-342","source":"Crossref","is-referenced-by-count":5,"title":["Cerebrospinal fluid cytology of an endolymphatic sac tumor"],"prefix":"10.1002","volume":"43","author":[{"given":"Jennifer P.","family":"Bynum","sequence":"first","affiliation":[{"name":"Department of Pathology The Johns Hopkins Medical Institutions Baltimore Maryland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Justin","family":"Bishop","sequence":"additional","affiliation":[{"name":"Department of Pathology The Johns Hopkins Medical Institutions Baltimore Maryland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Syed Z.","family":"Ali","sequence":"additional","affiliation":[{"name":"Department of Pathology The Johns Hopkins Medical Institutions 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