A- Wrong, the neoplastic cells had large vesicular nuclei with abundant cytoplasm which is not consistent with lymphocytes. Furthermore, the was no starry-sky appearance.
C- Wrong, no plasma cells can be seen.
D- Wrong, the lesion was consisted of a hypercellular component.
Question answer : CD1a
Right, note the dispersed oesinophils in between the neoplastic histiocytes. Moreover, many histiocytes have the characteristic coffee bean appearance of the nuclei.
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