Undifferentiated sarcoma of the pericardium after radiation therapy for Hodgkin's lymphoma.

Primary sarcomas of the pericardium are extremely rare malignant tumors of the heart. The incidence of sarcoma increases after radiation therapy in the field of breast. The specific features of this case report are the difficulties in diagnostics of undifferentiated spindle-cell sarcoma of the pericardium and the connection between the disease and the radiation therapy for Hodgkin's lymphoma.