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Mixed mesenchymal differentiation in meningiomas
Abstract:
Five intracranial meningiomas showing mixed mesenchymal differentiation are described. Three contained cartilage, three contained bone, four contained hyaline fibrous strands or nodules which in two instances were calcified, three contained angiomatous areas, one contained pericytoma-like areas, four contained pleomorphic and sometimes multinucleate giant cells, and one contained a mucoid matrix including spheroidal cells superficially resembling chordoma. The importance of recognising such tumours is emphasised as they can be misdiagnosed as metastatic deposits, particularly in a frozen section.
Insights
This study describes five intracranial meningiomas with diverse mesenchymal differentiation, including cartilage, bone, and giant cells. Recognizing these mixed tumors is crucial to prevent misdiagnosis as metastatic cancer, especially during frozen section analysis.
Area of Science:
- Neuropathology
- Surgical Pathology
Background:
- Intracranial meningiomas are tumors arising from the meninges.
- Mesenchymal differentiation in meningiomas can lead to diverse histological features.
Observation:
- Five cases of intracranial meningiomas with mixed mesenchymal differentiation were analyzed.
- Tumors exhibited varied components: cartilage, bone, hyaline fibrous tissue (some calcified), angiomatous areas, pericytoma-like areas, and pleomorphic giant cells.
Findings:
- One meningioma displayed a mucoid matrix with cells resembling chordoma.
- The presence of multiple mesenchymal elements complicates histological classification.
Implications:
- Accurate diagnosis of these complex meningiomas is vital.
- Awareness is needed to avoid misinterpreting these features as metastatic disease, particularly in intraoperative frozen sections.