A staging bone marrow aspirate and trephine biopsy is performed for a 15 year old female with Hodgkin Lymphoma. Automated full blood count shows: Hb 135g/L, PLT 467×10*9/L, WCC 15.1×10*9/L, neutrophils 13.2×10*9/L. No evidence of Hodgkin Lymphoma is seen on the trephine, but the following is seen on the aspirate:

Questions:

• What is this cell?
• What is going on?

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