Abstract
Meninges are more commonly affected than the brain parenchyma. Supratentorial location is more commonly involved than the infratentorial. The histological features correspond to the extracranial soft tissue and bone tumors. The cell of origin could be meninges, vasculature, or osseous structures. The WHO classification of CNS tumors, 2016 includes the spectrum of hemangiopericytoma/solitary fibrous tumor, hemangioblastoma, hemangioma, epithelioid hemangioendothelioma, angiosarcoma, Kaposi sarcoma, Ewing sarcoma/PNET, lipoma, liposarcoma, desmoid-type fibromatosis, myofibroblastoma, inflammatory myofibroblastic tumor, fibrosarcoma, undifferentiated pleomorphic sarcoma/malignant fibrous histiocytoma, leiomyoma, leiomyosarcoma, rhabdomyoma, rhabdomyosarcoma, chondroma, chondrosarcoma, osteoma, osteochondroma, and osteosarcoma. They range from benign grade I to highly malignant sarcoma, grade IV. Specific antibodies are needed for precise diagnosis. Detection of STAT6 nuclear expression or NAB2-STAT6 fusion is highly recommended to confirm the diagnosis of hemangiopericytoma/solitary fibrous tumor on immunohistochemistry. FLI 1 is a sensitive marker, however not specific, and maybe expressed by other tumors. RT-PCR for the presence of EWSR1-FLI1 or EWSR1-ERG fusion transcript or by FISH for EWSR1-gene rearrangement is confirmatory for Ewing sarcoma. Inhibin is the specific marker in stromal cells of hemangioblastoma and brachyury for chordoma.
The chapter illustrates multiple MR images and findings, intraoperative cytology, histopathology, IHC pictures, and their features along with differential diagnosis for each of the above, genetic profile, prognosis, and case studies.
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Chougule, M. (2020). Mesenchymal, Non-meningothelial Tumors. In: Neuropathology of Brain Tumors with Radiologic Correlates. Springer, Singapore. https://doi.org/10.1007/978-981-15-7126-8_14
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DOI: https://doi.org/10.1007/978-981-15-7126-8_14
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