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Figure 31 (left): Normal fatty marrow shows only a few, mildly dilated veins, shows no fibrosis and no
                   hemorrhage between fat cells.  Each fat cell is clear.
Figure 32 (right): Ischemic marrow shows slow replacement of fat cells by wispy fibrosis.   Dilated veins
                   result from backup pressures, and red blood cells are seen between fat cells.

Figure 33 (left): Chronic ischemia produces a streaming fibrosis between marrow fat clls, with scattered
                   chronic inflammatory cells, here including foamy histiocytes.
Figure 34 (right): Ischemia can lead to almost complete replacement of fat cells by fibrosis, here with a few
                   scattered chronic inflammatory cells.  Dense fibrosis can also result from poor healing after surgery.

Figure 35 (left): When there has been recent and major infarction of fatty marrow, all that remains is
                    blood with floating fatty microvesicles (small white spaces above) and large oil cysts
                   (large white spaces above), both evidence of fat necrosis.
Figure 36 (right): the wall of a socket (tooth is in upper left corner) shows most bone cells or osteocytes to
                   be missing, represented by white oval spaces.  Other signs of chronic ischemia include excess
                   purple cement lines and a microcrack along one of the lines.