Molecular Alterations in Meningioangiomatosis Causing Epilepsy

Area of Science:

• Neuro-oncology
• Developmental Neuroscience
• Molecular Pathology

Background:

• Meningioangiomatosis (MA) is a rare condition at the nexus of developmental and neoplastic brain disorders.
• MA frequently presents with epilepsy and poses diagnostic challenges.
• Understanding the molecular basis of MA is crucial for elucidating its pathogenesis.

Purpose of the Study:

• To investigate the molecular alterations in meningioangiomatosis (MA) and associated meningiomas.
• To differentiate the biological nature of pure MA versus MA associated with meningioma.
• To characterize the pathogenesis of this rare cerebrovascular lesion.

Main Methods:

• Retrospective analysis of 5 cases (3 pure MA, 2 MA-meningioma) diagnosed between 2004-2019.
• Comprehensive data collection including demographics, clinical, surgical, and radiological information.
• Next-generation sequencing of 1425 cancer-related genes in MA and meningioma tissues.

Main Results:

• MA-meningioma cases exhibited NF2 gene deletions in MA and/or meningioma components.
• Additional mutations in MA components suggest MA originates from the meningioma.
• Pure MA cases showed variants of unknown significance without known oncogenic driver alterations.
• Findings indicate distinct molecular profiles for MA-meningioma and pure MA.

Conclusions:

• MA-meningiomas possess a neoplastic character distinct from the hamartomatous/developmental nature of pure MA.
• The study provides a foundation for understanding MA pathogenesis.
• Molecular profiling is key to differentiating MA subtypes and informing clinical management.