Management of Small Interhemispheric Falx Meningiomas

Introduction to Treatment Approaches

The National Comprehensive Cancer Network recommends observation as the preferred initial approach for asymptomatic small falcine meningiomas, particularly if located in eloquent areas or if the patient has significant comorbidities 1
Early surgical resection may be considered in select cases when the tumor is easily accessible in non-eloquent cortex, to prevent future hemorrhage, or if the patient requires anticoagulation for other medical conditions, as suggested by the National Comprehensive Cancer Network 1

For asymptomatic small meningiomas (<30mm), observation is the preferred initial approach, with a median growth rate of 4 mm per year supporting a conservative approach, according to the National Comprehensive Cancer Network 1
Surgery is recommended for symptomatic small meningiomas (<30mm) if the tumor is accessible, followed by radiation therapy if WHO grade 3 or if incomplete resection occurs, as recommended by the National Comprehensive Cancer Network 1

The overall risk of death or nonfatal stroke after meningioma resection is approximately 6%, which exceeds the natural risk of a meningioma that has never bled (2.4% over 5 years), as reported in Neurosurgery 4
Permanent surgical morbidity ranges from 5-23% depending on tumor location, with deep-seated meningiomas carrying 5-18% postoperative morbidity, according to Neurosurgery 4

Benign (WHO grade 1) meningiomas grow slowly at approximately 4 mm per year, supporting a conservative approach for small asymptomatic lesions, as stated by the National Comprehensive Cancer Network 1
Many small asymptomatic meningiomas remain stable for years without causing symptoms, and the risk-benefit calculation shifts only when symptoms develop or growth is documented on serial imaging, according to the National Comprehensive Cancer Network 1

Complete resection (Simpson grade I or II) is the goal when surgery is undertaken, as extent of resection directly correlates with recurrence rates, as suggested by the National Comprehensive Cancer Network 1
Modern surgical techniques, including image-guided surgery and virtual reality planning, improve precision and reduce complications, according to the National Comprehensive Cancer Network 1

Delaying surgical consultation once progressive disabling symptoms develop can lead to irreversible neurological deficits, as warned by the National Comprehensive Cancer Network 1
Underestimating the surgical complexity of parasagittal/falcine meningiomas due to venous anatomy can lead to poor outcomes, and these require specialized neurosurgical expertise, as emphasized by Neurosurgery 4
Performing surgery solely based on size without considering symptoms, growth rate, location, and patient factors is not recommended, as stated by the National Comprehensive Cancer Network 1

MRI with contrast every 6-12 months is recommended for WHO grade 1 meningiomas under observation, as suggested by the National Comprehensive Cancer Network 1
After achieving stable disease status (typically 5-10 years), follow-up intervals can be extended, and clinical follow-up should include routine neurological examinations and assessment for new symptoms, according to the National Comprehensive Cancer Network 1