Protein-losing gastroenteropathy in a patient with concomitant systemic lupus erythematosus and Sjögren's syndrome.

We report a female in her twenties who developed generalized edema. She was diagnosed as systemic lupus erythematous (SLE) and Sjögren's syndrome (SS) based on her physical manifestations and positive findings for antinuclear antibody and anti-SS-A/SS-B-antibody. Although she manifested hypoproteinemia, a possibility of lupus nephritis was denied due to a lack of significant abnormality in kidney function tests and urinalysis. The nature of hypoproteinemia and related symptoms was identified as protein losing gastroenteropathy (PLGE) based on α 1-antitrypsin clearance and histopathology findings. Physicians should be aware that PLGE may develop as an underlying cause of edema in SLE and SS.