{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,7]],"date-time":"2026-03-07T19:54:27Z","timestamp":1772913267674,"version":"3.50.1"},"reference-count":18,"publisher":"Journal of Neurosurgery Publishing Group (JNSPG)","issue":"6","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["PED"],"published-print":{"date-parts":[[2010,6]]},"abstract":"<jats:p>Endoscopic third ventriculostomy (ETV) has been established as an effective method in the treatment of tumoral obstructive hydrocephalus. Delayed closure of the ETV stoma has been attributed to scarring involving the third ventricular floor. Secondary obstruction of the stoma due to intraventricular tumor seeding is an extremely rare condition, with only one case described to date. The authors report on a unique case of late closure of the ETV stoma caused by metastatic seeding of a recurrent medulloblastoma 9 years after the initial treatment. The patient was submitted to a second endoscopic procedure in which a reddish mass located just at the third ventricular floor was resected, leading to reopening of the previous ETV stoma.<\/jats:p>\n<jats:p>To the best of the authors' knowledge, this case is the first report of an ETV obstruction due to metastatic CSF seeding of a medulloblastoma. In such cases of late failure of the ETV stoma because of tumor obstruction, a second ETV can be safely performed and lead to adequate function of the stoma, even if limited by the aggressive nature of the disease.<\/jats:p>","DOI":"10.3171\/2010.1.peds09320","type":"journal-article","created":{"date-parts":[[2010,6,1]],"date-time":"2010-06-01T13:59:20Z","timestamp":1275400760000},"page":"641-644","source":"Crossref","is-referenced-by-count":10,"title":["Late obstruction of an endoscopic third ventriculostomy stoma by metastatic seeding of a recurrent medulloblastoma"],"prefix":"10.3171","volume":"5","author":[{"given":"Fl\u00e1vio","family":"Nigri","sequence":"first","affiliation":[{"name":"Department of Surgical Specialties, Division of Neurosurgery, Pedro Ernesto University Hospital, State University of Rio de Janeiro; and"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Carlos","family":"Telles","sequence":"additional","affiliation":[{"name":"Department of Surgical Specialties, Division of Neurosurgery, Pedro Ernesto University Hospital, State University of Rio de Janeiro; and"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marcus Andr\u00e9","family":"Acioly","sequence":"additional","affiliation":[{"name":"Department of Surgical Specialties, Division of Neurosurgery, Pedro Ernesto University Hospital, State University of Rio de Janeiro; and"},{"name":"Department of Neurology, University of S\u00e3o Paulo, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1754","reference":[{"issue":"3B","key":"b1-0050641","series-title":"Arq Neuropsiquiatr","doi-asserted-by":"publisher","first-page":"755","DOI":"10.1590\/S0004-282X2008000500031","article-title":"Unusual presentation of central nervous system metastases: mechanisms of spread and radiological findings","volume":"66","author":"Acioly","year":"2008"},{"key":"b2-0050641","series-title":"AJNR Am J Neuroradiol","first-page":"2514","article-title":"Functional analysis of third ventriculostomy patency by quantification of CSF stroke volume by using cine phase-contrast MR imaging","volume":"26","author":"Bargall\u00f3","year":"2005"},{"key":"b3-0050641","series-title":"J Clin Oncol","first-page":"3605","article-title":"Neoplastic meningitis","volume":"20","author":"Chamberlain","year":"2005"},{"key":"b4-0050641","series-title":"Neurosurgery","first-page":"623","article-title":"Adult medulloblastoma: prognostic factors and patterns of relapse","volume":"47","author":"Chan","year":"2000"},{"issue":"2 Suppl","key":"b5-0050641","series-title":"J Neurosurg","first-page":"118","article-title":"Late rapid deterioration after endoscopic third ventriculostomy: additional cases and review of the literature","volume":"105","author":"Drake","year":"2006"},{"key":"b6-0050641","series-title":"Lancet Neurol","doi-asserted-by":"publisher","first-page":"476","DOI":"10.1016\/S1474-4422(05)70140-X","article-title":"Lessons from brain mapping in surgery for low-grade glioma: insights into associations between tumour and brain plasticity","volume":"4","author":"Duffau","year":"2005"},{"key":"b7-0050641","series-title":"J Neurosurg","doi-asserted-by":"publisher","first-page":"1064","DOI":"10.3171\/jns.1963.20.12.1064","article-title":"Five-year comparative study of hydrocephalus in children with and without operation (113 cases)","volume":"20","author":"Foltz","year":"1963"},{"key":"b8-0050641","series-title":"J Neurosurg","doi-asserted-by":"publisher","first-page":"211","DOI":"10.3171\/jns.2002.97.1.0211","article-title":"Death after late failure of third ventriculostomy in children. 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