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Membranous obstruction of the inferior vena cava and systemic lupus erythematosus.

A 37-year-old woman who presented with systemic lupus erythematosus was found to have a membranous obstruction of the inferior vena cava above the hepatic veins, with an extensive collateral circulation. The obstruction was relieved by a renal vein-right atrial interposition graft, and this was followed by disappearance of the anti-nuclear and anti-DNA antibodies. We postulate that the systemic lupus erythematosus might have been provoked by life-long immune stimulation due to bowel-derived antigens bypassing the hepatic reticuloendothelial system and reaching the systemic circulation, or by immune hyperreactivity associated with the abnormal abdominal venous circulation.