Combined Intramedullary and Intradural Extramedullary Solitary Fibrous Tumor in Cervical Spine

We present a rare case of solitary fibrous tumor (SFT) located in the intramedullary (IM) and intradural extramedullary sites of cervical spine, mimicking thrombosed aneurysm and meningioma. Herein, we present a case of spinal intradural SFT in a 59-year-old woman. She presented to the outpatient clinic with a right-sided motor weakness for over a year. The case was initially misinterpreted as a thrombosed aneurysm of the poste-rior spinal artery. Cervical spine magnetic resonance imaging revealed a well-circumscribed intradural mass with isosignal intensity on T1 and T2-weighted images with markedly T2 dark signal focus and homogenous intense enhancement at the level of C6. Computed to-mography showed a slightly high-density mass without evidence of calcification or cystic component. Surgical removal was performed. However, due to combined IM component with adhesion, incomplete tumor resection was done. Pathologic analysis revealed hypo-cellular spindle cells with a thick collagenous stroma and immunohistochemical staining confirmed SFT. Spinal intradural SFT is a rare spindle cell tumor. Radiologists should con-sider SFT as a differential diagnosis if T2-weighted imaging shows an intradural located mass with markedly dark signal intensity focus.