Purpose: Solitary fibrous tumor is a rare spindle-cell tumor that usually is seen in the pleura. The orbit is one of the most common extrapleural sites. It is frequently misdiagnosed as hemangiopericytoma and is seen in older patients. We present the youngest case of this tumor, which was apparent in family photographs by age 10 and removed at age 15. The first reported echography findings are presented.
Methods: Case report and literature review.
Results: Solitary fibrous tumor was diagnosed by microscopy and immunohistochemical study that showed cells reactive with vimentin and CD34.
Conclusions: Solitary fibrous tumor of the orbit has been diagnosed with increasing frequency in recent years as the result of improved methods of pathologic examination. It is important to be aware of this tumor and recognize that it must be included in the differential diagnosis of highly vascular spindle-cell tumors even in young children.