High Resolution B-Scan Ultrasonography of the Orbit

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Abstract
Orbital pseudotumors are an important cause of unilateral exophthalmos and a significant cause of bilateral exophthalmos. These chronic inflammatory processes may cause focal orbital lesions, diffuse inflammation of normal orbital tissues, or both. The present report is based on a series of 35 proven cases of pseudotumor of the orbit, and describes the B-scan ultrasonographic appearance of the orbit in this condition. The presence of an orbital pseudotumor as a cause of exophthalmos is suggested by certain clinical features, but these are not diagnostic. B-scan ultrasonography can often demonstrate the presence of an orbital mass lesion or inflammatory edema of normal orbital structures, or both, in suspected cases of orbital pseudotumor, and can aid the clinician in management of these difficult problems.

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