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a In the third week of steroid medication, there is significant fat cell proliferation in the bone marrow. An increase in the size and number of fat cells, and bone marrow oedema is observed in group A (haematoxylin + eosin ×400). b Focal necrosis areas and decreased heamatopoesis in the bone marrow in week 5 resulting from steroid medication in group A (grade 2 osteonecrosis) (haematoxylin + eosin ×400)
