Common Locations of Meningiomas
Meningiomas most commonly occur at the convexity of the cerebral hemispheres (approximately 20-21%), followed by parasagittal regions (16%), and the falx (11-16%), with up to 90% being supratentorial or intraventricular in location. 1, 2, 3
Anatomical Distribution Pattern
Meningiomas arise from arachnoid cap cells in the meninges and can develop anywhere meninges or ectopic meninges exist 1. The spatial distribution shows a clear anterior-to-posterior gradient, with significantly more tumors in the frontal region, particularly parasagittally, along the anterior falx, and on the skull base of the frontal and middle cranial fossa 3.
Most Common Intracranial Locations (in descending order):
- Convexity: 20-21% of cases 2, 4
- Parasagittal/Falcine: 16% 2, 3
- Falx: 11-16% 2
- Sphenoid ridge: Common location 5, 4
- Suprasellar/Parasellar regions: Frequent 5
- Posterior fossa: Less common but notable 1
- Olfactory groove: Recognized location 5
Less Common but Clinically Important Locations:
- Intraventricular: More frequent in pediatric populations 1
- Posterior fossa/Cerebellopontine angle: Particularly in younger patients 2
- Skull base structures: Including petroclival, middle fossa 1
- Spinal epidural regions: Can occur 1
Unusual/Ectopic Locations:
Meningiomas can develop in unusual anatomical sites including 1:
- Nasal cavity and paranasal sinuses
- Middle ear
- Mediastinum
- Completely intraparenchymal (without obvious dural attachment)
- Intraosseous (within calvaria) 4
Age and Gender-Related Location Patterns
Gender differences significantly influence tumor location 2, 3:
- Females (who comprise 2/3 of cases): More likely to have lesions at the left parietal falx, tentorial regions, and right cerebellopontine angle; higher incidence of multiple meningiomas
- Males: More frequently present with lesions at the anterior fossa, frontal structures, and supratentorial locations
Age-related patterns 2:
- Older patients: Predominance in left frontal and occipital convexity
- Younger patients: More common in left sphenoid wing, right falx, parasellar/cavernous sinus, and middle fossa
Pediatric-Specific Location Patterns
In children and young people, the distribution differs notably from adults 1, 6:
- Up to 90% are supratentorial or intraventricular 1
- Most common location remains the convexity of hemispheres 1
- 63% occur in unusual locations in pediatric series, including 6:
- Intraparenchymal (33%)
- Intraventricular (33%)
- Intraosseous (17%)
- Paranasal sinus (8%)
- Intraspinal (8%)
Critical caveat: Pediatric meningiomas in unusual locations often lack the typical meningeal tail sign, leading to significantly higher preoperative misdiagnosis rates 6.
Location-Related Clinical Implications
Surgical accessibility varies by location 1:
- Lesions at the left parasagittal sinus and falx, tentorium, intraventricular regions, and skull-base structures are significantly more likely to receive only subtotal resection 2
- Intraventricular tumors carry higher surgical mortality risk 1
Recurrence patterns show location-specific trends 2:
- Recurrent meningiomas more frequently found at: occipital convexity, tentorium, sellar regions, parasagittal sinus, and left sphenoid wing
Molecular-Location Correlations
Tumor location correlates with underlying genetic mutations 7:
- Cerebral convexity and spinal meningiomas: Typically harbor 22q deletion and/or NF2 mutations
- Skull base meningiomas: More likely to have AKT1, TRAF7, SMO, and/or PIK3CA mutations
Special populations 1:
- Patients with Neurofibromatosis type 2 (NF-2) have higher risk of meningiomas in the spinal canal and optic nerve sheath
- SMARCE1-mutant clear cell meningiomas predominantly occur in the cerebellopontine angle and spine, particularly in younger individuals 8