woman with pyrexia of unknown origin and a 75year-old man with cardiac tamponade, in whom LE cells were detected in bone marrow aspiration and pericardial fluid samples, respectively; these cases emphasize the importance of a meticulous morphological examination of smears irrespective of gender and age of the patient, even in unusual situations. 7,8 To conclude, although well documented, LE cells in pericardial effusions are extremely rare. Both clinicians and cytopathologists should have a high index of suspicion for SLE in any young woman presenting with an unexplained serous effusion. When numerous, LE cells are easily detectable in body fluid samples, which is of paramount importance in the early management of patients with SLE. Hence, LE cell detection in body fluids is not merely of historical interest, but has an enormous clinical significance.