Giant-cell arteritis presenting as an orbital pseudotumor.

In this report a woman with giant-cell arteritis presenting as an orbital pseudotumor is described. Other causes of orbital pseudotumor were excluded in this patient. The pathogenesis of orbital pseudotumor caused by giant-cell arteritis is discussed. The concurrent arteritis of the superficial temporal artery and the rapid resolution of signs and symptoms after prednisone therapy supports the causal relationship between orbital pseudotumor and giant-cell arteritis in this patient.