IgG4-negative pituitary inflammatory pseudotumor with sphenoidal involvement resembling a macroadenoma

Fawwaz Almajali, Mohammad Almajali, Kate Schwetye, Georgios Alexopoulos, Maheen Khan, Jeroen Coppens, Philippe Mercier

Research output: Contribution to journalArticlepeer-review


Background: Inflammatory pseudotumors (IPTs) are rare benign conditions of unknown etiology that can affect any part of the body. IPTs are most commonly associated with Immunoglobulin G4 (IgG4)-related disease. Central nervous system IPTs, especially with pituitary involvement, are even rarer entities. The presence of an IgG4-negative pituitary IPT with simultaneous extracranial involvement has not been reported. Case report: We present the case of a 41-year-old female with past medical history of rheumatoid arthritis and a diagnosis of pituitary IPT with coexisting sphenoidal (extracranial) involvement mimicking a pituitary macroadenoma at presentation. The patient underwent multiple consecutive biopsies, and an extensive workup prior to establishing the diagnosis. Laboratory work-up showed normal serum IgG4 and unremarkable liver function tests. Conclusion: Pituitary lesions with simultaneous sphenoidal involvement in patients with IgG4-negative systemic inflammatory disease should raise the clinical suspicion for intracranial IPTs, as these tumors can mimic aggressive counterparts causing adjacent bony erosion, and local invasion.

Original languageEnglish
Pages (from-to)1886-1892
Number of pages7
JournalBritish Journal of Neurosurgery
Issue number6
StatePublished - 2023


  • Intracranial inflammatory pseudotumor
  • pituitary mass
  • pituitary pseudotumor
  • sellar pseudotumor
  • sphenoiditis


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