title: Intraosseous meningioma mimicking osteosarcoma in an adolescent: a case report.
abstract: Intaosseous meningiomas (IM) are the one of the less frequent benign tumors of     the skull. The etiology of IM has not been cleared yet. The frontoparietal and     orbital regions are the most common locations for IM. The average age for IM     diagnosis is 50.5. A 16-year-old girl with a right frontoparietal mass was     referred to our outpatient clinic. Cranial CT revealed a mass lesion which     resulted in expansion in the right parietal and posterior frontal bone, having     lytic and sclerotic regions inside with accompanying irregular cortex in inner     and outer tables of the calvarium. Prediagnosis was osteosarcoma according to     the imaging studies and after the performed biopsy and consecutive surgery, the     lesion was diagnosed as IM. Though CT with bone windows is often useful, it is     not always diagnostic. Biopsy plays an important role in calvarial vault lesions     for planning the treatment. In our case, malignant criteria in radiology did not     match the benign histology revealed. Radiological preoperative misdiagnosis of     meningioma is possible.
authors.affiliation: Haseki Training and Research Hospital, Neurosurgery Clinic, Istanbul, Turkey. mustafaeras@gmail.com
authors.forename: Mustafa Arif
authors.initials: MA
authors.lastname: Eras
authors.forename: Rabia
authors.initials: R
authors.lastname: Tari
authors.forename: Gulsah
authors.initials: G
authors.lastname: Ozturk
authors.forename: Buge
authors.initials: B
authors.lastname: Oz
authors.forename: Turgay
authors.initials: T
authors.lastname: Bilge
mesh_terms: D000293:Adolescent; D001706:Biopsy; D001859:Bone Neoplasms / Q000175:diagnosis*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008577:Meningeal Neoplasms / Q000175:diagnosis* / Q000601:surgery; D008579:Meningioma / Q000175:diagnosis* / Q000601:surgery; D012516:Osteosarcoma / Q000175:diagnosis*; D012886:Skull / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D014057:Tomography, X-Ray Computed