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Despite its classification among secondary headaches, the current definition of HaNDL does not contemplate a causal agent. Thus, the aetiology, as well as the pathogenesis of both the headache and the transient focal deficits, remains unknown.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Case presentation<\/jats:title>\n                <jats:p>We describe a 29-year-old healthy male developing episodes of thunderclap headaches associated with recurrence of hemiparesis\/hemi-paraesthesia; CSF showed lymphocytosis 200\/mm<jats:sup>3<\/jats:sup> and increased albumin; brain MRI revealed widespread leptomeningeal enhancement and a non-enhancing, circular diffusion restriction in the splenium of corpus callosum. Screening for neurotropic pathogens detected Epstein-Barr (EBV) DNA in serum and CSF, interpreted as a primary EBV infection once the seroconversion of EBV nuclear antigen (EBNA) IgM to IgG was proven on follow-up. Transcranial Doppler detected, during headache, increased flow velocity in middle cerebral arteries, possibly indicating vasospasm. Oral nimodipine was administered, with prompt clinical recovery, resolution of CSF\/MRI abnormalities, and normalization of flow velocities in middle cerebral arteries.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Case-based review<\/jats:title>\n                <jats:p>Although the definition of HaNDL does not contemplate a viral trigger or abnormal brain imaging, we found other literature cases of HaNDL associated with direct or indirect signs of CNS infection.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>At least in a proportion of patients, a viral aetiology may have a role in HaNDL. Whatever the aetiology, we suggest that the pathogenic mechanism may rely on the (viral or other) agent ultimately triggering cerebral vasoconstriction, which would explain both focal symptoms and headache. Calcium channel blockers might be a therapeutic option.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s40001-022-00815-8","type":"journal-article","created":{"date-parts":[[2022,10,8]],"date-time":"2022-10-08T21:02:22Z","timestamp":1665262942000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["HaNDL syndrome: a reversible cerebral vasoconstriction triggered by an infection? 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