RT Journal Article SR Electronic T1 Intracranial spread of IgG4-related disease via skull base foramina JF Practical Neurology JO Pract Neurol FD BMJ Publishing Group Ltd SP 240 OP 242 DO 10.1136/practneurol-2015-001315 VO 16 IS 3 A1 C M Rice A1 T Spencer A1 G Bunea A1 N J Scolding A1 P Sloan A1 U Nath YR 2016 UL http://pn.bmj.com/content/16/3/240.abstract AB IgG4-related disease (IgG4-RD) is a newly recognised, multiorgan, inflammatory disease, and its full clinical spectrum remains undefined. We present a biopsy-proven case of IgG4-RD presenting with a parapharyngeal mass with intracranial extension and possible involvement of the brain parenchyma. We highlight the importance of considering the diagnosis in those presenting with tumefactive lesions, leptomeningitis or pachymeningitis and emphasise the value of securing a tissue diagnosis so that appropriate long-term treatment can be instigated and complications avoided.