Computed Tomography in Orbital Pseudotumor (Idiopathic Orbital Inflammation)

Abstract
CT [computed tomography] scans of 9 patients with orbital pseudotumor (bilateral in 6 and unilateral in 3) showed findings distinct from those observed in Graves'' ophthalmopathy. In bilateral involvement, they ranged from localized mass lesions to complete obliteration of normal orbital CT anatomical landmarks; diffuse or multifocal lesions involving the posterior globe and muscle insertions were most typical of the diagnosis. Findings in unilateral pseudotumor may be indistinguishable from orbital mass lesions other than Graves'' ophthalmopathy. Serial CT scans were used to show progression of disease and response to treatment.

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