title: Metastatic meningioma presenting as cancer of unknown primary.
abstract: We describe a case of anaplastic meningioma presenting in an extracranial osseous location, initially diagnosed as cancer of unknown primary. Although anaplastic meningioma comprise 3% of all meningiomas, this subtype is more likely to be associated with metastases. The increased degree of dedifferentiation in anaplastic meningioma makes diagnosis difficult, especially if characteristic imaging findings of meningioma are not identified. Adequate tissue for diagnostic purposes and appropriate imaging studies may help in establishing a definitive diagnosis.
authors.affiliation: Department of Medical Oncology, Mayo Clinic , Rochester, MN, USA.
authors.forename: Vinay
authors.initials: V
authors.lastname: Gupta
authors.affiliation: Department of Medical Oncology, Mayo Clinic , Rochester, MN, USA.
authors.forename: Wilson I
authors.initials: WI
authors.lastname: Gonsalves
authors.affiliation: Department of Medical Oncology, Mayo Clinic , Rochester, MN, USA.
authors.forename: Steven I
authors.initials: SI
authors.lastname: Robinson
keywords: meningioma; metastasis; unknown primary