Abstract
Case report: We report 2 cases of orbital plasmacytoma in patients with known multiple myeloma. Orbital spread with secondary maxillary sinus involvement is reported in the first case. Case 2 is the first report of immunoglobulin A kappa light chain multiple myeloma involving orbital recti muscles. Computed axial tomography and magnetic resonance imaging aided the diagnosis, confirmed with histopathologic studies. Comments: Extraskeletal spread is rare and orbital involvement is exceedingly uncommon. From a review of the literature since 1972, we conclude that the immunoglobulin G type of multiple myeloma, whether lambda or kappa light chain, may be a risk factor for orbital involvement.
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