“…Extramedullary hematopoiesis, defined as the presence and growth of immature hematopoietic cells in other locations than the bone marrow in some benign or malignant diseases, is a consequence of a low production of hematopoietic cells in the bone marrow from various causes [ 3 , 11 ]. Extramedullary hematopoiesis is common in patients with CMPD, especially PMF [ 4 ], and more commonly affects the liver, spleen and lymph nodes, with hepatosplenomegaly, sometimes significant, and lymphadenopathy; however, it has been reported in other rare locations: heart, thymus, lung, pleura, dura mater, paraspinal region, gastrointestinal tract, peritoneum, mesentery, retroperitoneum, kidneys, adrenal glands, pelvis, uterus, breast, skin and soft tissue [ 2 , 4 , 5 , 7 , 8 , 9 , 12 , 13 , 14 , 15 , 16 ].…”