title: Neurosurgical implications of mannitol accumulation within a meningioma and its peritumoral region demonstrated by magnetic resonance spectroscopy: case report.
abstract: Mannitol is widely considered the hyperosmolar therapy of choice in routine neurosurgical practice for the reduction of intracranial pressure (ICP). The authors present a unique case of a patient with a large meningioma treated with mannitol, in which mannitol accumulation within the tumor and its surrounding parenchyma was shown using in vivo magnetic resonance spectroscopy (MRS). This rare appearance of mannitol on MRS was characterized by a wide-based peak at 3.8 ppm, which remained detectable several hours after the last dose. These findings provide the first in vivo evidence in support of the prevailing theory that mannitol leakage into the peritumoral edematous region may contribute to rebound increases in ICP and suggest that this phenomenon has the potential to occur in extraaxial tumors. Judicious use of mannitol in the setting of elevated ICP due to tumor may be indicated to avoid potentially deleterious side effects caused by its accumulation.
authors.affiliation: Neurosurgery Research Laboratory, Division of Neurological Surgery, St Joseph's Hospital and Medical Center, Phoenix, AZ 85013, USA.
authors.forename: Tejas
authors.initials: T
authors.lastname: Sankar
authors.forename: Rachid
authors.initials: R
authors.lastname: Assina
authors.forename: John P
authors.initials: JP
authors.lastname: Karis
authors.forename: Nicholas
authors.initials: N
authors.lastname: Theodore
authors.forename: Mark C
authors.initials: MC
authors.lastname: Preul
mesh_terms: D000368:Aged; D001921:Brain / Q000378:metabolism; D001932:Brain Neoplasms / Q000378:metabolism* / Q000601:surgery; D004234:Diuretics, Osmotic / Q000009:adverse effects / Q000493:pharmacokinetics*; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D008353:Mannitol / Q000009:adverse effects / Q000493:pharmacokinetics*; D008579:Meningioma / Q000378:metabolism* / Q000601:surgery
chemical_list: D004234:Diuretics, Osmotic; D008353:Mannitol