✓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.
Abbreviations used in this paper: BBB = blood–brain barrier; CT = computed tomography; ICP = intracranial pressure; MR = magnetic resonance; MRS = MR spectroscopy.
Address correspondence to: Mark C. Preul, M.D., Neurosurgery Research Laboratory, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, 350 West Thomas Road, Phoenix, Arizona 85013. email:
EssigMWeberMAvon Tengg-KobligkHKnoppMVYuhWTCGieselFL: Contrast-enhanced magnetic resonance imaging of central nervous system tumors. Agents, mechanisms, and applications. Top Magn Reson Imaging17:89–1062006
EssigM, WeberMA, von Tengg-KobligkH, KnoppMV, YuhWTC, GieselFL: Contrast-enhanced magnetic resonance imaging of central nervous system tumors. Agents, mechanisms, and applications. 17:89–106, 2006)| false
HolodnyAINusbaumAOFestaSProninINLeeHJKalninAJ: Correlation between the degree of contrast enhancement and the volume of peritumoral edema in meningiomas and malignant gliomas. Neuroradiology41:820–8251999
HolodnyAI, NusbaumAO, FestaS, ProninIN, LeeHJ, KalninAJ: Correlation between the degree of contrast enhancement and the volume of peritumoral edema in meningiomas and malignant gliomas. 41:820–825, 1999)| false