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An opaque arachnoidal membrane seals the internal cerebral and basal veins, leading to thalamic, basal ganglia, mesencephalic\/pontine infarctions if injured. Medium-size tumours can be removed en-bloc with all traction\/manipulation applied on the tumour side, virtually without contact of ependymal surfaces of\u00a0the pulvinars or third ventricle. Sacrifice of the cerebello-mesencephalic fissure vein may be required.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>The sitting position offers superior anatomical orientation and remains safe with experienced teams. Meticulous microsurgical techniques and detailed anatomical knowledge are likely to secure safe outcomes.<\/jats:p><\/jats:sec>","DOI":"10.1007\/s00701-021-04821-3","type":"journal-article","created":{"date-parts":[[2021,5,3]],"date-time":"2021-05-03T15:45:55Z","timestamp":1620056755000},"page":"79-85","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Pineal region tumours in the sitting position: how I do it"],"prefix":"10.1007","volume":"164","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6984-8796","authenticated-orcid":false,"given":"Priya","family":"Sharma","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mohd","family":"Abdul","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Manprit","family":"Waraich","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7166-5729","authenticated-orcid":false,"given":"George","family":"Samandouras","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2021,5,2]]},"reference":[{"issue":"4","key":"4821_CR1","doi-asserted-by":"publisher","first-page":"525","DOI":"10.3171\/jns.1979.50.4.0525","volume":"50","author":"L Dade Lunsford","year":"1979","unstructured":"Dade Lunsford L, Maroon JC, Sheptak PE, Albin MS (1979) Subdural tension pneumocephalus. 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