An Uncommon Orbital Neoplasm: Solitary Fibrous Tumor: Case Report

The purpose of this case report is to present an intraconally located orbital solitary fibrous tumor, an uncommon fibroblastic tumor of the orbit which has diagnostic challenges. A 33 years old female patient presented with three years of slowly progressive mass and proptosis of the left eye. Magnetic resonance imaging demonstrated a well-defined, strongly enhancing intraconal orbital mass. Histopathological and immunohistochemical analysis following en bloc removal of the lesion revealed a mesenchymal tumor showing strong positivity for CD34 and Vimentin. The diagnosis was solitary fibrous tumor. Although uncommon, solitary fibrous tumor should be kept in mind in the differential diagnosis of a well-defined orbital mass associated with slowly progressive proptosis.