Solitary fibrous tumour of the orbit: an unusual presentation.

Solitary fibrous tumour is a rare tumour that usually arises from the pleura and very uncommonly from the orbit. This unusual unilateral orbital mass can be differentiated from the more common haemangiopericytoma by the use of histopathological and immunohistochemical studies. The tumour is strongly Immunoreactive for CD34, which supports its diagnosis.