title: [A case of intrasellar meningioma mimicking pituitary adenoma].
abstract: The authors report a patient with a rare intrasellar meningioma mimicking pituitary adenoma. A 60-year-old man was admitted to our hospital for evaluation of general fatigue. He had no neurological deficit including visual function. Endocrinological tests revealed panhypopituitarism. The craniogram showed slight enlargement of the sella turcica with thinning of the dorsum sellae. CT scan and MR imaging demonstrated a homogeneously enhanced intrasellar mass with slight suprasellar extension. Partial removal of the mass was performed via the transsphenoidal approach because it was extremely firm and hemorrhagic. Histological diagnosis was transitional meningioma. The patient has been well for two years after surgery without tumor progression on MR imaging. It is mandatory to distinguish intrasellar meningioma from pituitary adenoma preoperatively because of marked difference in their treatment strategies. Despite recent advances in neurodiagnostic imaging, it may still be difficult to differentiate pituitary adenoma from intrasellar meningioma. When we re-evaluated the MR imaging, we recognized that the tumor had demonstrated specific findings, ruling out pituitary adenoma, namely bright and homogeneous enhancement, dense enhancement in the early phase on the dynamic MR study, and flow void signal within the mass. The authors emphasize that careful evaluations of MR imaging will allow the correct preoperative diagnosis in patients with intrasellar meningioma mimicking pituitary macroadenoma.
authors.affiliation: Department of Neurosurgery, Kobe City General Hospital, 4-6 Minatojima-naka-machi, Chuo-ku, Kobe 650-0046, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Matsumoto
authors.forename: M
authors.initials: M
authors.lastname: Hayase
authors.forename: H
authors.initials: H
authors.lastname: Imamura
authors.forename: Y
authors.initials: Y
authors.lastname: Oda
authors.forename: H
authors.initials: H
authors.lastname: Kikuchi
authors.forename: M
authors.initials: M
authors.lastname: Katayama
authors.forename: T
authors.initials: T
authors.lastname: Ishihara
mesh_terms: D000236:Adenoma / Q000175:diagnosis*; D003937:Diagnosis, Differential; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008577:Meningeal Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D008579:Meningioma / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D008875:Middle Aged; D010911:Pituitary Neoplasms / Q000175:diagnosis*; D012189:Retrospective Studies; D012658:Sella Turcica / Q000473:pathology; D014057:Tomography, X-Ray Computed