The Teaching Point

Intraosseous schwannoma of the petrous apex is a rare entity, and thus may be neglected when considering the differential diagnosis of a newly discovered petrous apex lesion. While diagnosis of intraosseous schwannoma has traditionally been made by histological examination after surgery, an awareness of its appearance on CT (expansile, isodense, and minimally erosive) and MRI (T1 W isointense, T2W hypo or hyperintense, and homogenously enhancing) makes it possible to suggest this diagnosis preoperatively.






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Intraosseous Schwannoma of the Petrous Apex

Free full text article: Intraosseous Schwannoma of the Petrous Apex

Abstract
Primary neoplasms of the petrous apex are rare and include eosinophilic granuloma, chondroma, chondrosarcoma, chordoma, and schwannoma. We report just the second published case of an intraosseous schwannoma of the petrous apex and are the first to describe the entity using magnetic resonance imaging. By studying the computed tomography and magnetic resonance imaging features of this rare tumor, it is possible to suggest the diagnosis preoperatively.






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1. Magnetic Resonance Imaging

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