Extramedullary Hematopoiesis in a Lymph Node
High power view of extramedullary hematopoiesis in a lymph node showing megakaryocytes within a background of maturing granulocytic elements. The presence of megakaryocytes may create confusion with Hodgkin's disease. Immunostain for CD61 (megakaryocytic marker; see next image) can help sort out the diagnosis. Image courtesy of Dr. Michael Spears, USA. Used with permission.