Metaplastic bone formation in the orbit

Abstract

Osseous or cartilaginous metaplasia in the orbit are both rare phenomena. The authors describe a unique case of combined primary orbital osseous and cartilaginous metaplasia presenting with orbital pain and ocular dysmotility and discuss the radiologic, histopathologic, and clinical features. This entity should be considered in the differential diagnosis of an orbital mass showing similar radiographic features of calcification.