{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,20]],"date-time":"2026-06-20T05:17:14Z","timestamp":1781932634692,"version":"3.54.5"},"reference-count":15,"publisher":"BMJ","issue":"5","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["Pract Neurol"],"accepted":{"date-parts":[[2023,7,3]]},"published-print":{"date-parts":[[2023,10]]},"abstract":"<jats:p>Hypertrophic pachymeningitis is a rare disorder of the dura mater of the spine or brain. It can be caused by inflammatory, infective or neoplastic conditions or can be idiopathic. We report a man with hypertrophic pachymeningitis and bilateral chronic subdural haematoma caused by IgG4-related disease. We highlight the diagnostic challenges and discuss possible underlying mechanisms of subdural haematoma formation in inflammatory conditions. Isolated IgG4-related hypertrophic pachymeningitis with chronic subdural haematoma is very rare; previously reported cases have suggested a possible predilection for men in their sixth decade, presenting with headache as the dominant symptom. Given the rarity and complexity of the condition, it should be managed in a multidisciplinary team setting.<\/jats:p>","DOI":"10.1136\/pn-2023-003750","type":"journal-article","created":{"date-parts":[[2023,7,17]],"date-time":"2023-07-17T13:20:52Z","timestamp":1689600052000},"page":"441-445","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":3,"title":["IgG4-related hypertrophic pachymeningitis with chronic subdural haematoma"],"prefix":"10.1136","volume":"23","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4102-7408","authenticated-orcid":false,"given":"Nicole","family":"Lichtblau","sequence":"first","affiliation":[{"name":"Department of Neurology, King's College Hospital NHS Foundation Trust, London, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jahard","family":"Aliaga-Arias","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, King's College Hospital NHS Foundation Trust, London, UK"},{"name":"Department of Medical and Surgical Specialties, Radiological Sciences and Public Health, Universita degli Studi di Brescia, Brescia, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dimitrios","family":"Kalaitzoglou","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, King's College Hospital NHS Foundation Trust, London, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Istvan","family":"Bodi","sequence":"additional","affiliation":[{"name":"Clinical Neuropathology, King's College Hospital NHS Foundation Trust, London, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Keyoumars","family":"Ashkan","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, King's College Hospital NHS Foundation Trust, London, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ranj","family":"Bhangoo","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, 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