Solitary fibrous tumor with intracranial invasion.

Dr. Leonardo C. Welling – Rua Sacadura Cabral 178 Hospital dos Servidores do Estado RJ / Serviço de Neurocirurgia / 7° andar 20221-161 Rio de Janeiro RJ Brasil. E-mail: [email protected] Various orbital pathological process can cause unilateral proptosis, these include a variety of neoplastic and non-neoplastic lesions. The most common cause of unilateral and bilateral proptosis is Graves’s disease. Other common causes of proptosis are lymphomas and metastatic lesions. Less common causes include inflammatory pseudotumors, hemangiopericytomas, nerve sheat tumors, fibromatosis and meningeomas. Mesenchymal tumors of the orbit account for 5–8% orbital neoplasms. These include solitary fibrous tumors (SFT) which are benign neoplasms with uncertain histogenesis. The World Health Organization includes SFT’s among mesenchymal, non-meningothelial tumors. They have been described in the pleura, skin, orbit, paranasal sinuses and other sites. Atypical or malignant SFT’s are often encountered in the thorax but extrathoracic malignant tumors are much more rare. Solitary fibrous tumors occur most commonly in adults and show a slight male predominance. We present an unusual case of paranasal SFT with orbital and intracranial invasion.