Differential diagnosis of pericardial effusion after stem cell transplantation in acute myeloic leukemia.

The pathology underlying a pericardial effusion in a 24-year-old patient, who had suffered from acute myeloic leukemia 5 years previously and undergone chemotherapy followed by whole body radiation prior to allogeneic stem cell transplantation, could be identified by the careful analysis of pericardial cytology and epicardial biopsy guided by flexible pericardioscopy. Molecular, histological, cytochemical and immunological examination of the effusion and the epicardial biopsy for a viral or bacterial infection despite known CMV reactivation, or an effusion induced by radiation or graft-versus-host reaction, could be ruled out as possible causes of pericardial tamponade. The infiltration of CD 117-positive cells in the biopsied cardiac tissue revealed recurrent acute myeloic leukemia now also affecting the heart and the pericardium. An intrapericardial instillation of 1000 mg triamcinolone acetate at day 1 and 50 mg/m(2) cisplatin at day 3 effectively prevented the recurrence of tamponade, but could not prevent a lethal outcome 3 weeks later.