title: Emergence of a high-grade sarcoma in a recurrent meningioma: malignant progression or collision tumor?
abstract: Anaplastic meningiomas that resemble sarcomas often reveal clues to their meningothelial differentiation or develop in a plausible setting that confirms their meningothelial origin. Malignant mesenchymal neoplasms without obvious evidence of meningothelial differentiation or origin are more likely to be true primary or metastatic sarcomas. Because of their clinical and biological differences, it is important to distinguish anaplastic meningioma from a sarcoma. We present a 67-year-old woman with multiple meningiomas, who developed a high-grade spindle cell tumor 6 months after the resection of a World Health Organization grade I meningioma. It was not clear whether this tumor represented a malignant transformation of meningioma or a primary sarcoma. Malignant transformation of a meningioma is exceptional within this short period and a coexisting sarcoma and meningioma are equally uncommon. Even though these malignant neoplasms are rare in general, they appear to be more prevalent in patients with multiple meningiomas including those with neurofibromatosis type 2.
authors: Department of Pathology, Istanbul University Cerrahpasa School of Medicine, Istanbul, Turkey.
authors: Buge
authors: B
authors: Oz
authors: Melike
authors: M
authors: Pekmezci
authors: Reza
authors: R
authors: Dashti
authors: Kutlay
authors: K
authors: Karaman
authors: Cengiz
authors: C
authors: Kuday
authors: Tarik
authors: T
authors: Tihan
mesh_terms: D000368:Aged; D003937:Diagnosis, Differential; D018450:Disease Progression; D005260:Female; D006801:Humans; D008577:Meningeal Neoplasms / Q000473:pathology*; D008579:Meningioma / Q000473:pathology*; D009364:Neoplasm Recurrence, Local / Q000473:pathology*; D009378:Neoplasms, Multiple Primary / Q000473:pathology*; D012509:Sarcoma / Q000473:pathology*