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We describe the case of a 43-year-old woman who presented with primary Sjögren's syndrome (SS) which manifestated as unconsciousness due to M protein. A diagnosis of SS was made based on a ten-year history of dryness, a Shirmer test, and the histological findings of labial biopsy. A rouleaux formation was observed and serum protein electrophoresis revealed a monoclonal spike of 4.0 gm/dl in the gamma-region, which was characterized as IgA-lambda. Biopsy of the minor salivary glands showed marked polyclonal lymphoproliferation with lymphoid follicles, including both T cells and B cells as revealed by immunohistological staining. Therefore, the patient had a lymphoproliferative lesion of the minor salivary glands, which is also known as pseudolymphoma. We conclude that fainting associated with marked M protein may be manifestation of SS. Such cases should be followed carefully since the subsequent neoplastic transformation of pseudolymphomas have been previously reported.

Primary Sjoegren's syndrome presenting as unconsciousness associated with IgA-.LAMBDA. M-protein.