Bone marrow histology (hematoxylin-eosin as well as reticulin stain) before and after treatment with lenalidomide in 2 patients with myelofibrosis with myeloid metaplasia who achieved major anemia response as well as resolution of peripheral-blood leukoerythroblastosis. The 2 patients represent patients 1 and 2 from Table 5. Images were obtained by using a Leeds Olympus AX70 microscope (Olympus, Minneapolis, MN) equipped with a 160×/0.4 objective lens and a Nikon DXM1200 digital camera (Nikon, Melville, NY); Nikon ACT-1 software version 2.62 was used to acquire digital images. No further image processing was conducted.