Idiopathic inflammatory pseudotumour of the orbit: CT features correlated with clinical outcome.

Idiopathic orbital pseudotumour is an inflammatory condition which usually presents as an orbital mass. The response to treatment is variable and often unpredictable. In this study we have assessed the spectrum of computed tomographic (CT) appearances in 17 patients. Four categories of orbital pseudotumour were identified by CT based on the location and extent of the inflammatory process within the orbit. Patients within each of the four categories had broadly similar clinical outcomes. CT was valuable in identifying certain prognostic features enabling better clinical and therapeutic planning.