This bone marrow is from a patient with chronic myelocytic leukemia. It is hypercellular and contains only a small amount of fat. There are a number of megakaryocytes, which are the largest cells of the bone marrow. The number of megakaryocytes is estimated in the thickest part of the particle and not in the sinusoidal blood. The normal number is 3-10 per low-power field. More than 15 in one field in the particle is considered increased. If you have to search for them and find only 1-2 per particle, they are decreased.
Course Section: 06. Microscopic Examination of the Bone Marrow
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