Emergency Department Management of Suspected Meningioma

Diagnostic Imaging

MRI is the radiological imaging modality of choice for suspected meningioma, as it provides detailed characterization of the lesion and surrounding structures 1
Typical MRI findings include superficial, hemispheric isointense or hypointense masses on T1-weighted images, hyperintense masses on T2-weighted images, strong and uniform contrast enhancement, characteristic "dural tail sign", evidence of calcifications, and presence of peritumoral edema 1
CT scan may be used if MRI is contraindicated, showing isodense or hypodense lesions, possibly with calcifications, hyperostosis in skull-based tumors, and evidence of cortical buckling and cortical vessels 1

Evaluate for neurological symptoms based on tumor location, including subtle weakness, sensory changes, or cranial nerve deficits, and document any seizure activity 2
Assess for signs of increased intracranial pressure, such as headache, vomiting, papilledema, in cases with significant mass effect 2
Evaluate for brainstem compression symptoms in posterior fossa lesions 2
The British journal of neurosurgery recommends assessing for seizure activity, which may be associated with meningiomas 3

For patients with significant neurological symptoms or evidence of brainstem compression, immediate neurosurgical consultation is recommended, and consider dexamethasone administration to reduce peritumoral edema 2
For patients with seizures, administer appropriate antiepileptic medication and consider continuous monitoring during imaging studies 3

Skull base meningiomas may require specialized surgical expertise and multidisciplinary approach, and image-guided neuronavigation is invaluable in planning the operative approach 5
Intraventricular meningiomas require careful surgical planning and consideration of approach, and have a higher risk of significant blood loss during surgery 1
Pediatric meningiomas are more likely to present with calcifications and cystic transformation, and may have different characteristics than adult meningiomas 1
The British journal of neurosurgery recommends specialized pediatric neurosurgical expertise for pediatric meningiomas 6

Failing to recognize that not all enhancing dural-based lesions are meningiomas, and other entities such as brain metastases, gliomas, and primary CNS lymphoma can mimic meningiomas 7
Overlooking the need for specialized surgical expertise for complex locations such as skull base or intraventricular meningiomas 5
Underestimating the potential for significant blood loss during surgery, particularly with large or intraventricular tumors 1

Consider somatostatin receptor PET imaging in complex cases where diagnosis is uncertain, as it has high accuracy in differentiating meningioma from treatment-related changes or other lesions 3
Elevated uptake exhibits a high positive predictive value for meningioma 7