title: Plasma cell granuloma of the pituitary gland. Case report.
abstract: BACKGROUND
  Plasma cell granuloma, one of the subtypes of inflammatory pseudotumor, is non-neoplastic proliferation of plasma cells and occurs extremely rarely in the intracranial space. We encountered a case of plasma cell granuloma in the pituitary gland, which initially presented with left oculomotor palsy.
  
  
  METHODS
  A 34-year-old female presented with left ptosis. Magnetic resonance image (MRI) demonstrated an intrasellar mass extending to the pituitary stalk with dural enhancement. The lesion was subtotally resected by a transsphenoidal approach. Histopathological findings showed that the resected mass consisted of mature plasma cells, and some cells had infiltrated the surrounding normal pituitary tissue. Immunohistochemical study demonstrated that these cells were positive for leukocyte common antigen, kappa and lambda light chains of IgG, indicating polyclonality of these plasma cells.
  
  
  CONCLUSIONS
  We propose that, in the case of an intrasellar mass with unusual neurological symptoms including oculomotor palsy, inflammatory disease of the pituitary gland such as plasma cell granuloma should be included in the differential diagnosis.
authors.affiliation: Department of Neurosurgery, Kamitsuga General Hospital, Kanuma, Tochigi, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Murakami
authors.forename: K
authors.initials: K
authors.lastname: Muraishi
authors.forename: H
authors.initials: H
authors.lastname: Ikeda
authors.forename: T
authors.initials: T
authors.lastname: Yoshimoto
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D005260:Female; D006104:Granuloma, Plasma Cell / Q000150:complications / Q000175:diagnosis* / Q000473:pathology; D006801:Humans; D008279:Magnetic Resonance Imaging; D009886:Ophthalmoplegia / Q000209:etiology; D010911:Pituitary Neoplasms / Q000150:complications / Q000175:diagnosis* / Q000473:pathology