Reactivation of Pulmonary Tuberculosis following Treatment of Myelofibrosis with Ruxolitinib

Figure 3

Supraclavicular lymph node (hematoxylin and eosin stain, 500x) with focal areas of extramedullary hematopoiesis, including megakaryocytes (yellow arrow). The inset (CD61 immunohistochemistry, 500x) highlights frequent atypical megakaryocytes (brown) staining positive for CD61 (a platelet and megakaryocytes marker), consistent with the underlying diagnosis of primary myelofibrosis.