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S13C22P20-1: To the right and below the center of this field, in a bone marrow biopsy specimen, a population of pale spindle cells forms a sheet. Eosinophils are sprinkled among the spindle cells. Spicules of
cancellous bone outline the area. Above the sheet, there is a lymphoid nodule with scattered collections of large, pale lymphoid cells. The lymphoid infiltrates have partially eroded the bone spicule to the left;
other bone spicules are scalloped along their margins (systemic mastocytosis).
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