[Difficulties in diagnosing systemic lupus erythematosis--the LE phenomenon in pericardial effusion as the primary symptom of the disease].

A case of systemic lupus erythematosus is reported in a woman aged 41 years with exudative pericarditis as the predominating manifestation of the disease. Attention is called to the diagnostic usefulness of demonstration of LE cells in pericardial effusion.