INTRAOSSEOUS MENINGIOMA MIMICKING OSTEOSARCOMA IN AN ADOLESCENT

Intaosseous meningiomas(IM) are the one of the less frequent benign tumors of the skull. Etiology of IM has not been cleared yet. Frontoparietal and orbital regions are the most common locations for IM. The average age diagnosed to be IM 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 biyopsy 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, malign criteria in radiology did not match the benign histology revealed. Radiological preoperative misdiagnosis of meningioma is possible.

intraosseous meningioma osteosarcoma adolescent